thats a bit to smart for GW.  i have not read the necron codex,  but i dont really go for this whole old ones or the ctan thing, its bollo9cks.  its new fluff,  i dont like the way they just randomly make stuff up and kill off original stuff as the old timers who remember it from when they were young get old married and forget,  then you get the little kids coming up with there crap fluff they have misread or heard from the red shirts and try tell you how it is an you just think F off you spotty greasy haired little Pr/ck

And the C'tan (at least) were mentioned way back in RT . Can't remember if there was a reference to the Necrons or not.

Both the Flesh Eaters and Rainbow Warriors have now and then been labeled as the missing First Founding chapters by various folks. Both date back to the RT days and have extremely limited printed fluff, which is probably the source of the speculation.

Both are also sometimes labeled as successor chapters as well, so make of it what you will. (Flesh Eaters being a 3rd founding of the Blood Angels, and the Rainbow Warriors being a 3rd founding of the White Scars.)

Here is the bit I dug up on the 'net a while ago, compiled by 'some guy I don't know'.

                Turned to Chaos before the Horus Heresy,<?

                1^st edition stated they had an omophagea geneseed defect (ie, same as Blood Angels)

                Alternately, Tyrant Guard & Primarch Tyrannius

                Or, Iron Hearts & Rubinek, from Into the Maelstrom 203-204

                Note that WD98 has the Mentors training the Flesheaters

                Turned to Chaos before the Horus Heresy

                Some claim the Rainbow Warriors are a successor chapter

                Lord Corfer of Raind said to be the primarch

                www.inisfail.com/archives claims they are 3rd Founding from White Scars

The Grey Knights are most definitely NOT one of the two. They were created after the 20 First Founding chapters were already in existance.

How about the Adeptus Custodes, where do they fit into all of this? It is said that they are to a Grey Knight what a Grey Knight is to a normal Space Marine. Could they be one of the two, or are they more of a Legion Zero type deal?

The true answer is that there is no answer. Even had GW originally named the two, they have since retracted any such statments. The air of mystery surrounding the two lost legions is just too good to destroy. They will not be named.

Yes, yes. Good, good.

Eaters my friend, Eaters. While the Flesh Tearers are well defined, the Flesh Eaters are a bit murky in their fluff. Hence the speculation.

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You coulda figured this out years ago by reading the lizardman dex

It's definatly not new fluff, and you'd of known that too if you had realised that Warhammer and Warhammer 40k are connected in the same time frame, and read any of the fluff about the old ones in the Warhammer books

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The old ones created the slann, the orks, the skinks, the krox, the saurus.... just about every living thing in the unniverse.... the old ones however..... are in no way slann

Certain employees did. But that has all been swept under the rug AFAIK.

Never happened. 40K and Fantasy are completely seperate.

which employees?? you know they just make it up as they go along.  specially the red shirts,  they just sit around all days coming up with their own theories.

hey kinda like us,  oh my god we are the internet red shirts,  only difference is we dont get paid to have these discussions whereas they do.

Yet the old ones are refered to as "the old ones" even in the eldar mysteries their is a definition between the old ones and the slann. One may think that the real problem may be could the emperor be one of these "old ones?"

onto the records expunged chapters. there are more primarchs than we know about too. Im sure that there were references to the lost primarchs. Also there were some that were destroed before the emperor found them. Also the cursed founding, what of these chapters? The point i have is that even if the primarchs were destroyed the Dark angels were well into the army stage before the got Lion el Johnson. So technically there could easily be lost primarchs chapters out there searching for their as yet undiscovered unmade primarch. Oh what cool fluff!

Take this all with a grain of salt because I read the Warhammer Fantasy Roleplay book like 16 years ago, but I think it gives a very full origin for the Warhammer world.  I believe it specifically names the Slann as settling the WFB planet via warp gates located at the poles.  Eventually they lost control of the gates and the greenskins began flooding in.  I'm not sure if this happened before or after the orcs arrived, but warpstone, which I think was described as "the raw stuff of chaos" began literally flying out of the gates and mutated rats into skaven and people into beastmen.

The RT era stuff had a lot of hints that the WFB world was in the 40K galaxy.  The amazons used bolt pistols that they'd found amongst the Slann/Lizardman ruins in Lustria.  Zoats existed in both continuities, in 40K they were specifically used as a tyranid vanguard race.  Even recently the Albion wargear that appeared at the end of the campaign was obviously 40K stuff, there was a powerfist and a rosarius plus some other stuff I can't recall.

So if he looks like a duck (primarch).... walks like a duck (primarch)..... he's a duck (primarch)....

And wasn't he found and adopted..... just like all the other primarchs?

Nagash and Orion are entirely different, as both of them have stated places of "birth".... as in, "DID NOT FALL FROM THE SKY"

You know that twin tailed comet that signalled the coming of Sigmar? Space capsul anyone?

And as for Sigmar being only a normal size man.... taken from the back of the Empire dex,  Page 75, describing the scene where the orc warlord and Karl Franz were fighting.

"The Warlord stopped. He could not believe what he was seeing. He had been fighting a man in armour... so why was the figure standing before him that of a "gigantic" warrior dressed in furs? This was not the same person, this was taller, more powerful, but the hammer he raised in the air was the  very same legendary weapon. The man shouted a loud battle cry that boomed among the mountains as it had done so many centuries before: "Unberogen!"

At that sound the instincts of the Warlord were overcome by memories inscribed in the soul of his race, memories of mighty barbarians defeating the Orcs in the war for the domination of the rich plains, and driving them to the desolation beyond the mountains. In those times Men were led by this very same champion, he who has denied the possession of this land to the green-skinned race"

P.R.I.M.A.R.C.H.

And actually, I'm betting that what happened was that the ruling elite of terra found him..... "Him dissapearing" and on the way back to earth, assassinated him so to quell any resistance to their rule.... of course, this would have happened after the betrayel.

I dig Sigmar being a Primarch, and his 'death' could be that he was found and spirited away.  Who he was found by is anyones guess...  Chaos could have found him and destroyed him or turned them to their own devices, the Emperor could have found him, and then he was lost in the warp.

I also think folks confuse the timeline of the Old World and of Terra.  What's 2500 in OWT, could easily be 38K in Terra Time.