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So as it seems there has been many debates over this topic in a lot of forums as well as here. Some have come up with what they think is the answer and some have just refused to play with certain rules. I believe I may have found the answer (but I am sure even with rule book clauses to back it up, someone will still disagree).

Specifically with Eldar/ Dark Eldar allies.

What I see as facts....

* Battle brothers can cast powers on each other. BRB pg. 112
* Codex Eldar powers (Guide, Fortune) Specifically require the power to be cast on an Eldar unit. Eldar Codex pg. 28
* Dark Eldar units are not Eldar units. They have 2 separate codecies.

This means that Rulebook powers can be cast from Eldar to Dark Eldar. DE can benefit from a Farseer's Prescience or other beneficial powers.

This also means that a Farseer can NOT target a unit of DE with fortune or Guide. It's all pretty simple up until now.

But what happens when a unit is part eldar and part DE? Well it cant be.

There are 2 possibilities...

1. An Eldar IC joins a DE unit. Ex. Farseer on jetbike joins reavers.

2. A DE IC joins an Eldar unit. Ex. Archon joins Harlequins purchased from the Eldar FOC.

In scenario 1, the farseer can cast fortune on himself (an eldar unit) and then join the reavers to also allow them to benefit from Fortune. FALSE. This is proven wrong on BRB pg. 39 in the "independent characters and ongoing effects" section, paragraph 3 in the parenthesis.
Also in scenario 1, the farseer is already with the unit of reavers and casts Fortune on himself within the unit and then the power is shared with the Reavers. Also FALSE. BRB pg. 39 Last paragraph in the "joining and leaving a unit" section.
This pretty clearly (IMO) shows that there will be no fortuning of reavers or any other DE unit that I can see. When an IC joins a unit, he becomes part of that unit for all rule purposes. Meaning a Farseer will become DE for rule purposes when with a unit of Reavers.

In scenario 2, an Archon joins a unit of Harlequins that have been fortuned already. The archon benefits from the Fortune. FALSE. This is proven wrong on BRB pg. 39 in the "independent characters and ongoing effects" section, paragraph 3, first sentence.
Also in scenario 2, the Archon is already joined with the Harlequins, and a Farseer fortunes the unit. The archon benefits from the Fortune. TRUE. BRB pg. 39 Last paragraph in the "joining and leaving a unit" section. As I stated above, an archon that has joined an Eldar unit will be treated as Eldar Himself for all rule purposes.
So as far as I can tell and with what I present here, 2++ re-rolls CAN happen and are legal. It doesnt matter if some other codex got some FAQ that makes some wargear only effect units of that codex and not battle brothers (space wolves im looking at you). Unless there is something I have completely missed, this all seems pretty clear cut and dry once you find the clauses in the BRB. I hope this can put a close to the large amounts of arguments on this topic.

Does this all make sense to everyone else? Or is there more to the debate then what I have put here?

All Points are TRUE.
The ultimate ruling here is this:
"the Archon is already joined with the Harlequins, and a Farseer fortunes the unit. The archon benefits from the Fortune. TRUE. BRB pg. 39 Last paragraph in the "joining and leaving a unit" section. As I stated above, an archon that has joined an Eldar unit will be treated as Eldar Himself for all rule purposes."

That is the only way a DE unit can get fortune. In short, only a DE IC can get fortuned since this is the only way a DE unit can join an ELDAR unit.

I wasn't aware this was still a debate. If a DE or Tau IC attaches to an Eldar unit then they can benefit from eldar powers. Non-eldar units can never be the target of eldar powers.

There is a debate out there about "Dark Eldar are just a sub-catagory of Eldar fluff-wise"howeer mixing rules and fluff just ends in orks never losing

mikkoboi wrote:That is the only way a DE unit can get fortune. In short, only a DE IC can get fortuned since this is the only way a DE unit can join an ELDAR unit.

Many DE players will QQ but this is how I see it. While it is true that Eldar is in the name for Dark Eldar, they are considered far different from their kin and are not true Eldar anymore. They are not psychic in the lore, nor does the wording in the Codex say anything other than Eldar. Not even friendly, but Eldar. I take Dark Eldar as being not Eldar, but something different.

BlueDagger wrote:howeer mixing rules and fluff just ends in orks never losing

And a 10-man Tac Squad taking out an Apocalypse sized army of [insert Army name here].

There comes a point where using fluff to argue rules gets ridiculous.

Yes, it is correct that any Ally IC that can join an Eldar unit will recieve the effects of fortune or guide (the only 2 powers that target friendly eldar units in the codex).

That is IF they are already in the unit when the power is cast.