Board Thread:Warhammer 40k General Discussion/@comment-91.224.27.226-20131031140001/@comment-24332685-20131225175637

All of these are logical and possible alternatives based on what little we know which is both insanely frustrating and incredibly mysterious. It is possible the Primarchs were killed before joining their legions and that the legions themselves left leaderless strayed, but I think it is more likely Russ's Censor came after they rejoined their legions. The one thing I am certain of is at least one of them still lives. I mean if the Emperor spared Angron who actually tried to attack his own father there is the possibility that he let these two live and just imprisoned them. Legionaire I agree the Ultramarines growth as a legion could be attributed to the vastness of the Ultramar region which they controlled and recruited from. However,  it is the speed with which they grew that makes me hesitant to believe it. The recruitment, training and implantation of a space marine takes significant time and resources to complete before a marine is made. It is not like simply recruiting a regular army soldier who is could be trained in several months. Don't get me wrong I am ruling nothing out we literally can't based off of what we know. Also now that I think of it, all of the Primarchs were found because they made statues of the 20 Primarchs surrounding the Imperial Palace.