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Nerak wrote:That was only the case in the Ultramarines legion. They already had the chapter system in place. Many of the primarchs disagreed with the chapter system and, when the codex astartes was presented (post HH), it was only accepted by about half of the primarchs.

Don't you know? If you play any chapter except deviant chapters like DA, BA, SW and BT then you are automatically Ultramarines. Fastest way to tick me off ever is look over at my Crimson Fists while I'm setting up and say "Oh, you play Ultramarines." One of the things about 2nd Ed. that I really wish would die a death.


The Sable Swords were created from the Astral Knights, and I assume the few Battle Brothers left over from the AK were used as the basis for the veteran company and probably leadership positions. I imagine any new chapter is originated the same way. "Here's a squad from each of our companies, break them up and make them Veteran Sergeants or Captains or whatnot."

 Just Tony wrote:

Nerak wrote:That was only the case in the Ultramarines legion. They already had the chapter system in place. Many of the primarchs disagreed with the chapter system and, when the codex astartes was presented (post HH), it was only accepted by about half of the primarchs.

Don't you know? If you play any chapter except deviant chapters like DA, BA, SW and BT then you are automatically Ultramarines. Fastest way to tick me off ever is look over at my Crimson Fists while I'm setting up and say "Oh, you play Ultramarines." One of the things about 2nd Ed. that I really wish would die a death.


The Sable Swords were created from the Astral Knights, and I assume the few Battle Brothers left over from the AK were used as the basis for the veteran company and probably leadership positions. I imagine any new chapter is originated the same way. "Here's a squad from each of our companies, break them up and make them Veteran Sergeants or Captains or whatnot."

I bet you must have been really cross when Crimson Fists got demoted from First Founding while the Ultras got promoted

 MechaEmperor7000 wrote:

 Just Tony wrote:

Nerak wrote:That was only the case in the Ultramarines legion. They already had the chapter system in place. Many of the primarchs disagreed with the chapter system and, when the codex astartes was presented (post HH), it was only accepted by about half of the primarchs.

Don't you know? If you play any chapter except deviant chapters like DA, BA, SW and BT then you are automatically Ultramarines. Fastest way to tick me off ever is look over at my Crimson Fists while I'm setting up and say "Oh, you play Ultramarines." One of the things about 2nd Ed. that I really wish would die a death.


The Sable Swords were created from the Astral Knights, and I assume the few Battle Brothers left over from the AK were used as the basis for the veteran company and probably leadership positions. I imagine any new chapter is originated the same way. "Here's a squad from each of our companies, break them up and make them Veteran Sergeants or Captains or whatnot."

I bet you must have been really cross when Crimson Fists got demoted from First Founding while the Ultras got promoted

It was the reason that I sat out of 2nd Ed. and didn't start serious gaming after getting given a copy of Rogue Trader along with some Beakies until I came across the 3rd Ed. codex at my LCS with that sexy CF art on the cover. But yeah, the swapparoo between those two in the fluff left me inconsolable, and Ward's 5th Ed. codex left me IRATE. "It can be said that there are three categories of Space Marine Chapter." "Chapters in the second category are disciples who owe their genetic inheritance to another Primarch, but follow the Codex Astartes as keenly as their divergent heritage allows. While primarily composed of successor Chapters, this group also incudes several Chapters of the First Founding - notably the Imperial Fists, White Scars, and Raven Guard. These Chapters can never be Ultramarines, for their gene-seed is not that of Roboute Guilliman, Nevertheless, they will ever aspire to the standards and teachings of the great Primarch." Garbage.

The great ward-ening of 5th edition was a dark time indeed.

I really like the Crimson Fists, moreso than the Imperial Fists. They seem more personal and more well-rounded to me. Especially compared to the Ultras.

This is a topic I have discussed on here many times before so I'll copy and paste some of the information from an earlier post.

The process of creating a Chapter, at least up to the point of any potential recruits being implanted (making the gene-seed, materiel, finding a homeworld, testing possible recruitment sources for the future et cetera), at least up to that point, takes decades or even centuries (see Deathwatch: Rites of Battle page 13). After all other considerations have been met it is likely to be 'at least a century' (D: RoB pg14) before the new Chapters take to the field.

Potentially this would mean that any 'new' Chapter could be several centuries old before it is formally sent off to do whatever it is the High Lords want it to do. This means that all 'new' Chapters are exactly that, a fully autonomous, self-regulating Chapter and not just one thousand scouts barely out of their twenties.

As to the matter of training, it is simply not true that Astartes can only be trained or trained properly by other Astartes; how were the Legions trained prior to the Great Crusade otherwise? They were not trained by other Astartes because they were the first. They were not trained by the Thunder Warriors because they (bar one or two that escaped and survived) were dead. They did not cut their teeth in the reconquest of Earth because they were not involved. Never-the-less the Legions were trained in the use of their equipment, tactics et cetera.

Basically there is very little information available and what does exist is light on details. What we do know is that from the High Lords decreeing a Founding to a Chapter being sent out into the galaxy takes centuries. We do not know where the initial recruits come from. We do not know where they are taken to begin the implantation process. We do not know who trains these initiates or who decides when they are ready, how they decide or how long this process takes.

We do know that the origins for many Chapters are lost. We do know that some Chapters claim they are descended from a specific Chapter and sometimes this claim is merely acknowledged, sometimes denied or in rarer cases the two Chapters might even be on friendly terms. In cases where Chapters have direct involvement in the creation of a Chapter the instances are basically unique: for example, the Master of the Dark Angels directly petitioning for the creation of a Chapter, the Sons of Medusa were Iron Hands, joined by Marines from other Irons Hands Successors who all left their parent Chapters due to a schism and then joined up with each other, eventually becoming a new Chapter.

There is very little evidence for the so called 'Cadre Theory' whereby a Chapter sends officers, wargear and other assorted goodies to a newly Founded Chapter to basically take it over.

I've always been against the Cadre Theory mainly because there is little evidence to support it and because it goes against the basic principle of the Codex Astartes: the point being that Chapters exist to stop another Horus Heresy, the Chapters are small and autonomous, so the Cadre Theory essentially gives a Chapter a thousand Space Marines to mould and shape however they see fit. On the face of it, it seems reasonable but, it does require much logical thought to see all the holes in the idea. But then I'm biased against the Cadre Theory because I reckon it's a bunch of gak.

My own personal idea is that new Chapters are created and trained in the Sol System: we already know that gene-seed tithes are sent to Mars and that, when a Chapter is being created, all of the necessary Test-Slaves are brought to Mars so that a thousand sets of gene-seed can be created so it doesn't seem too much of a stretch that they also gather suitable recruits and implant them on Mars as well. With that in mind, I would say that training these new Marine son Mars, or within the Sol System logically follows. As to who would train them then that's really anyone's guess. To my mind it does not need to be other Space Marines: my evidence for this is the Legions, they were created and trained in the Sol System prior to the Great Crusade, not by other Marines, because they were the first, and not by the Thunder Warriors because they no-longer existed, so who did train them? Who picked the Chapter Masters and Praetors? I would say the likelihood is that human soldiers, of some description or other, did this. It doesn't take that many years for a civilian to be trained to be a soldier and then be in a position to train new soldiers. The same principle could well apply to Marines, they get some kind of basic drill, education et cetera and over a period of years natural leaders come to the fore and are then in a position to form the basis for an officer corps for the Chapter. After an initial push, these new Marines would essentially train themselves and choose their own leaders, in so far as these leaders would come to the fore due to their innate aptitudes. This training, whatever form it takes, and by whatever mechanism it is imparted, is said to last for a least a century, perhaps longer, more than enough time for a Chapter Master to be appointed once the Marines are ready to be deployed.

The problem with comparing them to the original Legions is that there's implication that they weren't trained conventionally, as the War Hounds (the legion that would be renamed World Eaters once Angron found them) was said to have fought in the Unification Wars, which implies they fought alongside the Thunder Warriors. The Legion's first master (not chapter master, just their overall commander) wasn't even appointed until long after the Legion had came into being.

And there were implications that much of the legions didn't know what they were doing. Perturabo was pissed enough at his own legion's records that he ordered decimation (i.e: killing off 10% of his entire legion at random). And this was already after some time they've spent crusading with the Emperor.

As for the time it takes for a founding, it is far more than a mere century; the announcement of a founding doesn't come at the start of the tasks required, The construction of the Fortress-Monastery, Chapter equipment, cultivation, training, all take place long before the announcement of a founding, which itself will be a good century or two before the chapters become officially "active".

As for the Cabal theory, it's largely because a lot of subsequent foundings do result in chapters becoming loyal to their "parent" chapter. The most obvious is the Dark Angels, but in the Shield of Baal campaign it's shown that the Blood Angels share this too (when Baal is attacked, almost all of the blood angel successors that can jump back to help comes). Another angle to be seen is possibly the chapter-in-training is deployed under the watch of an existing chapter in a campaign, basically listening to their elder chapter until it's deemed that their officers are competent enough to lead autonomous actions.

If assuming the Cabal theory isn't true, then it could be assumed that the Marines aren't trained by any conventional force, but pitted against other marines from the same Founding. No marine chapter is ever founded alone, with each founding having large batches of marines. It is not out of the question that they could simply pit the newly-formed neophytes against each other and see how many of them survive the centuries-long founding process. As for tactics and how to use their equipment, all marines are told to memorize the Codex Astartes, so it's not like they're just tossed a gun and expected to know how to use it.

 MechaEmperor7000 wrote:
As for the Cabal theory, it's largely because a lot of subsequent foundings do result in chapters becoming loyal to their "parent" chapter. The most obvious is the Dark Angels, but in the Shield of Baal campaign it's shown that the Blood Angels share this too (when Baal is attacked, almost all of the blood angel successors that can jump back to help comes).

True, but most known DA and BA successors are from the time the Legions were split up. They took much of the original Legion's traditions with them and know for sure that they are related. Ultramarine heritage Chapter number 450 might be told they are UM descendants but they're pretty far from their spiritual liege in time (and often distance as well). Marneus Calgar could certainly get a lot of Chapters to show up if he asked for it but it's not really the same as the tight-knit Angels except for those original 2nd Foundings.

On the other hand every Chapter that gets even a little bit of detail seems to have traditions of some sort. If it does take a century or more just to found one it's possible some traditions are established then, but some do seem like things no one trained by ordinary humans and the Codex would ever come up with. Recruitment for example - the Ultramarines really seem to have that one down perfectly, selecting the cream off the top from Ultramar military academies while secondary choices go on as normal humans or possibly get drafted if a primary aspirant dies in training. IMO it's rather extreme to go from that point to some of the risky and wasteful recruitment practices we hear about, like having aspirants fight to the death, travel through hostile/dangerous territory or hunt dangerous beasts.

Don't forget that Imperial Fists and their successors also keep close ties, including the Feast of Blades.

Spetulhu wrote:

 MechaEmperor7000 wrote:
As for the Cabal theory, it's largely because a lot of subsequent foundings do result in chapters becoming loyal to their "parent" chapter. The most obvious is the Dark Angels, but in the Shield of Baal campaign it's shown that the Blood Angels share this too (when Baal is attacked, almost all of the blood angel successors that can jump back to help comes).

True, but most known DA and BA successors are from the time the Legions were split up. They took much of the original Legion's traditions with them and know for sure that they are related. Ultramarine heritage Chapter number 450 might be told they are UM descendants but they're pretty far from their spiritual liege in time (and often distance as well). Marneus Calgar could certainly get a lot of Chapters to show up if he asked for it but it's not really the same as the tight-knit Angels except for those original 2nd Foundings.

On the other hand every Chapter that gets even a little bit of detail seems to have traditions of some sort. If it does take a century or more just to found one it's possible some traditions are established then, but some do seem like things no one trained by ordinary humans and the Codex would ever come up with. Recruitment for example - the Ultramarines really seem to have that one down perfectly, selecting the cream off the top from Ultramar military academies while secondary choices go on as normal humans or possibly get drafted if a primary aspirant dies in training. IMO it's rather extreme to go from that point to some of the risky and wasteful recruitment practices we hear about, like having aspirants fight to the death, travel through hostile/dangerous territory or hunt dangerous beasts.

Actually a good number of DA and BA successors were from subsequent foundings. The majority of Second Founding Chapters were Ultramarines because after the heresy, they had the most marines at the time. Anaziel (then Supreme Grand Master) apparently specifically petitioned the founding of a DA successor Chapter with the specific (hidden) goal of hunting Cypher to the exclusion of all else, and DAs actually have this close-knit tendency so far that the High Lords of Terra do not use their gene seed as much, despite the gene seed being just as pure as the Ultramarines, for fear of them all swearing loyalty to the Dark Angels Chaptermaster rather than be separate, autonomous forces.

 MechaEmperor7000 wrote:
...fear of them all swearing loyalty... ...rather than be separate, autonomous forces.

I think this largely supports my stance against the Cadre Theory and goes along with what I said earlier, about a cadre of officers going against the spirit of the Codex Astartes. There is a clear risk that an extant Chapter could send officers to a newly founded Chapter and, in essence, take over the Chapter for their own use.

Going back to the point about the Foundling Marines fighting each other, this goes along with something I have said here on Dakka before. Assuming that all of these Chapters are created within the Sol System, it would mean than several tens of thousands of Marines are present in the Sol System to act in its defence and, with these 'un-Chaptered' Marines being far more in the control of the Adeptus Terra and the High Lords they would provide a very formidable and controllable defence force, with their first loyalty to the High Lords at the point in their creation cycle rather than to some other existing Chapter/s.

It does raise the question of what actually comes first: the decree for a new Founding or the Marines? With my own ideas I have it that there is a constant rolling creation of Marines in the Sol System, potentially hundreds of thousands of Space Marines, some at Initiate level, others at what could be considered Veteran level. When a thousand Marines get to what level is deemed requisite then they get given a name and Colour Scheme and along with the other X amount of ready Chapters, the Founding is declared and virtually instantly, X amount of Chapters are sent off to wherever they are needed.

I would like to think that these un-Chaptered Marines fight and live as one not-Legion but that would mean that all the Chapters in a Founding would know each other pretty well, it could even be the case that Marines that have trained together for decades could get assigned to different Chapters, but their bonds would not be so easily broken. There is some evidence in the background that a Founding's Chapters do have ties to each other, the Dark Founding Chapters for instance are all supposed to be 'out there, waiting' which implies they are out there, together. As with everything else though, there just isn't enough detailed information to make any kind of definitive conclusion and mostly it's just fanon.

The other problem, taking the example of the Dark Founding, is that it's hard to come up with an textbook idea for a Founding as the information we do have suggests that each Founding is somewhat unique compared to any others. Between the First, Second, Dark and Cursed Foundings, you have almost a fifth of the total Foundings as one off events. If we are lucky we get some dates for the other Foundings, with a few names of Chapters from any particular Founding but for the majority of them, there is literally no information at all.

 Gogsnik wrote:
Going back to the point about the Foundling Marines fighting each other, this goes along with something I have said here on Dakka before. Assuming that all of these Chapters are created within the Sol System, it would mean than several tens of thousands of Marines are present in the Sol System to act in its defence and, with these 'un-Chaptered' Marines being far more in the control of the Adeptus Terra and the High Lords they would provide a very formidable and controllable defence force, with their first loyalty to the High Lords at the point in their creation cycle rather than to some other existing Chapter/s.

Ehh... that also means there are several tens of thousands of Space Marines ready to corrupt and use for your own ends if a High Lord involved in it decides to use them for something later declared as heresy or treason. It's just the sort of temptation the Chapter structure in the Codex Astartes was supposed to keep away - a thousand Marines is a formidable force but not enough to really get the idea of forming your own Empire. Having lots of them (even inexperienced ones) in the Sol system is inviting another Heresy, which is why only the most trusted ones are allowed there at all. IIRC they're actually greatly feared in the Sol system thanks to the Heresy and some later things like the Vandire incident - the Imperial Fists have recruitment rights on Terra, which no other Chapter has.

Simple just become the only member of your chapter.

 Gashrog wrote:

tneva82 wrote:

 Jehan-reznor wrote:

TiamatRoar wrote:
For the 2nd founding, many of the chapter masters of the new chapters were captains and commanders of the predecessors. /obvious

That was not the question,

I guess the parent chapter training them makes the most sense

Don't see why it has to be parent chapter though. Okay same geneseed makes it easier but if parent chapter isn't available/willing why not have some other chapter that's available to the task to train them up?

If one is basing new blood angel based chapter but nearest blood angels are like other side of the galaxy seems bit inefficient to bring...Surely some other existing(maybe another blood angel successor) chapter could do the trick as well?

The only canon source I know of that actually supports the idea of training cadres at all is NovaMarines entry in Imperial Armour volume 9, which actually says of them:
Descendants: None officially listed, but they are known to have had the honour of their brethren selected to aid the founding of several Ultramarines gene-seed successor chapters in the past, notably the Dark Sons and Angels of Fury.

I think this response is the one that answers my question the best, thank you. Also, thanks for the great discussion, guys. It really helped my understanding of the background!

Gogsnik wrote:

 MechaEmperor7000 wrote:
...fear of them all swearing loyalty... ...rather than be separate, autonomous forces.

I think this largely supports my stance against the Cadre Theory and goes along with what I said earlier, about a cadre of officers going against the spirit of the Codex Astartes. There is a clear risk that an extant Chapter could send officers to a newly founded Chapter and, in essence, take over the Chapter for their own use.

Sure.

It does raise the question of what actually comes first: the decree for a new Founding or the Marines? With my own ideas I have it that there is a constant rolling creation of Marines in the Sol System, potentially hundreds of thousands of Space Marines, some at Initiate level, others at what could be considered Veteran level. When a thousand Marines get to what level is deemed requisite then they get given a name and Colour Scheme and along with the other X amount of ready Chapters, the Founding is declared and virtually instantly, X amount of Chapters are sent off to wherever they are needed.

I would like to think that these un-Chaptered Marines fight and live as one not-Legion but that would mean that all the Chapters in a Founding would know each other pretty well, it could even be the case that Marines that have trained together for decades could get assigned to different Chapters, but their bonds would not be so easily broken. There is some evidence in the background that a Founding's Chapters do have ties to each other, the Dark Founding Chapters for instance are all supposed to be 'out there, waiting' which implies they are out there, together. As with everything else though, there just isn't enough detailed information to make any kind of definitive conclusion and mostly it's just fanon.
.

The only thing we know about new chapters is that the replication process gives you a group of a thousand marines who all come from a single progenoid's worth of zygotes. So there are a thousand, and all their sets of organs are identical. Then any other iteration makes another chapter's worth of organs that are identical within that thousand but not the others.

I don't think it follows that they are randomly mixed.

=Angel= wrote:

pelicaniforce wrote:

Darthslowe wrote:

I think it is a perplexing question because, according to my knowledge of fluff, these foundings are done with existing geneseed and are often done without the consent of the parent chapter. This means a chapter of entirely new Space Marines just pops into existence. If the leadership of the new chapter is chosen from amongst newly created battle-brothers, how are these chapters not just wiped out due to incompetent leadership?

I would love to hear thoughts on this.

Who over the chapter master ends up being, they are still in charge of either 1000 scouts or 1000 marines who are just about qualified for the Ninth Company devastator squads. They could have Calgar, Culn, and Azrael as officers and they would be less powerful than most chapters, because they have inexperienced marines. If they go out on their own, with Dante and Sicarius in charge, they will still not perform perfectly.

In a normal chapter, there are inexperienced scouts and reserve marines. What they are used for is support of battle companies, e.g. battle company is attacking a citadel in a hive city, and there are reserve marines making diversionary attacks or fighting a rearguard against more enemy forces that are trying to relieve the defenders.

That's the level of capability that new chapters have. They are a thousand guys who can support battle companies. The only thing they can reasonably do is fight with other chapters for several decades. Then, their chapter master doesn't have the opportunity to destroy the chapter through incompetent leadership. The person making the decisions is someone experienced who is running the campaign, like Logan Grimnar, who commanded all the Imperials in the thirteenth black crusade, or Carab Culln, who was Magister Militum for the loyalists in the Badaab war.

If there is a senior chapter master who has deployed the reserve company to a planet to fight with a battle company, and a battle company captain commanding the three or four companies on the planet, then the other captains of those companies have very limited responsibilities. They are sort of platoon leaders, or second lieutenants. They don't have as much power to accidentally destroy their companies.

So the chapter master of a new chapter mainly has to impress another chapter master enough the he lets them crusade with his chapter. It doesn't take more than a very bright junior officer to do that. You can appoint junior officers right away from new marines, because that's what officers usually are. It's a different job than being a battle brother.

I disagree with this. You have roughly 900 space marines in power armour and the last few hundred+ training as scouts. They will have about 5-10 years between implantation and power armour and that will be spent kicking ass in the simulators and in live fire exercises (fighting a penal legion sentenced to death, putting down a small insurrection, spawncamping necrons etc)
They are superhumans trained to exceptional standards before they are allowed hold a bolter.

A newly formed chapter won't have the centuries of experience of an older one but it will be perfectly capable of completing any given mission. Consider the clones on Geonosis, their first engagement and Captain America, right after his transformation hunting down that assassin. 900 men bred for war and armed and armoured to the highest standards. The experience comes later- the killing starts now.

It doesn't seem like that has anything to do with the point. You can have a chapter master who is less experienced lead his own troops along side more experienced forces.

pelicaniforce wrote:

Gogsnik wrote:

 MechaEmperor7000 wrote:
...fear of them all swearing loyalty... ...rather than be separate, autonomous forces.

I think this largely supports my stance against the Cadre Theory and goes along with what I said earlier, about a cadre of officers going against the spirit of the Codex Astartes. There is a clear risk that an extant Chapter could send officers to a newly founded Chapter and, in essence, take over the Chapter for their own use.

Sure.

It does raise the question of what actually comes first: the decree for a new Founding or the Marines? With my own ideas I have it that there is a constant rolling creation of Marines in the Sol System, potentially hundreds of thousands of Space Marines, some at Initiate level, others at what could be considered Veteran level. When a thousand Marines get to what level is deemed requisite then they get given a name and Colour Scheme and along with the other X amount of ready Chapters, the Founding is declared and virtually instantly, X amount of Chapters are sent off to wherever they are needed.

I would like to think that these un-Chaptered Marines fight and live as one not-Legion but that would mean that all the Chapters in a Founding would know each other pretty well, it could even be the case that Marines that have trained together for decades could get assigned to different Chapters, but their bonds would not be so easily broken. There is some evidence in the background that a Founding's Chapters do have ties to each other, the Dark Founding Chapters for instance are all supposed to be 'out there, waiting' which implies they are out there, together. As with everything else though, there just isn't enough detailed information to make any kind of definitive conclusion and mostly it's just fanon.
.

The only thing we know about new chapters is that the replication process gives you a group of a thousand marines who all come from a single progenoid's worth of zygotes. So there are a thousand, and all their sets of organs are identical. Then any other iteration makes another chapter's worth of organs that are identical within that thousand but not the others.

I don't think it follows that they are randomly mixed.

=Angel= wrote:

pelicaniforce wrote:

Darthslowe wrote:

I think it is a perplexing question because, according to my knowledge of fluff, these foundings are done with existing geneseed and are often done without the consent of the parent chapter. This means a chapter of entirely new Space Marines just pops into existence. If the leadership of the new chapter is chosen from amongst newly created battle-brothers, how are these chapters not just wiped out due to incompetent leadership?

I would love to hear thoughts on this.

Who over the chapter master ends up being, they are still in charge of either 1000 scouts or 1000 marines who are just about qualified for the Ninth Company devastator squads. They could have Calgar, Culn, and Azrael as officers and they would be less powerful than most chapters, because they have inexperienced marines. If they go out on their own, with Dante and Sicarius in charge, they will still not perform perfectly.

In a normal chapter, there are inexperienced scouts and reserve marines. What they are used for is support of battle companies, e.g. battle company is attacking a citadel in a hive city, and there are reserve marines making diversionary attacks or fighting a rearguard against more enemy forces that are trying to relieve the defenders.

That's the level of capability that new chapters have. They are a thousand guys who can support battle companies. The only thing they can reasonably do is fight with other chapters for several decades. Then, their chapter master doesn't have the opportunity to destroy the chapter through incompetent leadership. The person making the decisions is someone experienced who is running the campaign, like Logan Grimnar, who commanded all the Imperials in the thirteenth black crusade, or Carab Culln, who was Magister Militum for the loyalists in the Badaab war.

If there is a senior chapter master who has deployed the reserve company to a planet to fight with a battle company, and a battle company captain commanding the three or four companies on the planet, then the other captains of those companies have very limited responsibilities. They are sort of platoon leaders, or second lieutenants. They don't have as much power to accidentally destroy their companies.

So the chapter master of a new chapter mainly has to impress another chapter master enough the he lets them crusade with his chapter. It doesn't take more than a very bright junior officer to do that. You can appoint junior officers right away from new marines, because that's what officers usually are. It's a different job than being a battle brother.

I disagree with this. You have roughly 900 space marines in power armour and the last few hundred+ training as scouts. They will have about 5-10 years between implantation and power armour and that will be spent kicking ass in the simulators and in live fire exercises (fighting a penal legion sentenced to death, putting down a small insurrection, spawncamping necrons etc)
They are superhumans trained to exceptional standards before they are allowed hold a bolter.

A newly formed chapter won't have the centuries of experience of an older one but it will be perfectly capable of completing any given mission. Consider the clones on Geonosis, their first engagement and Captain America, right after his transformation hunting down that assassin. 900 men bred for war and armed and armoured to the highest standards. The experience comes later- the killing starts now.

It doesn't seem like that has anything to do with the point. You can have a chapter master who is less experienced lead his own troops along side more experienced forces.

yeah, does not mean that the new chapter deploys alongside a older one for a time, and that a senior captain could respecfully provide support until the chapter master is ready to take the lead himself, slowly taking a bigger role till ready.