Board Thread:Warhammer 40k General Discussion/@comment-26331252-20151005162829/@comment-26420219-20160103202218

It’s really complicated matter and both of you are right, in Seventh Serpent Alpharius tricks the Loyalists of the Sysipheum in attacking a "renegade" Alpha Legion Legate, which means that he refused to follow his twin Primarchs into treachery or siding with Horus.

Ultimately only Omegon and Alpharius had dealings with the Cabal (in accordance with Legion), so it may well be that the Alpha Legion itself considers itself as a Traitor Legion for siding with Horus,  but for motives that are far closer to those defended by the Loyalists, aka the preservation of the galaxy from Chaos. And as for what 86.173.133.71 said, who knows what happened in the ten millennia since the Horus Heresy? The Index Astartes on the Alpha Legion indicates that the Alpha Legion did not retreat into the Eye of Terror with the other Traitor Legions, but scattered and hid within the Imperium itself. This would mean that noone - save perhaps Omegon - from M30 would still be alive. The only true existence of the Alpha Legion in the 41st Millenium are splinter Warbands such as the Faithless that are aligned with Chaos and still prosecute the Long War and cultic activities. For all we know the "true" Alpha Legion could be doing anything, hiding out, stasis-sealed and waiting to be released, corrupted by Chaos or masquarading as several distinct loyalist Space Marine Chapters after having a change of hearts.