Board Thread:Warhammer 40k General Discussion/@comment-6078851-20130130174042/@comment-7186329-20130317144124

That would make sense. The initial genetic experiments carried out by The Emperor resulted in the Custodians, they were the prototype enhanced by his own genome, however the process turned out to be too complicated and costly. Because of that The Emperor continued further experimentation to simplify the process and keep the improvements, that resulted in the Thunder Warriors, which had defects. Later on He improved and perfected the process with the Adeptus Astartes. By that time ,having realised that there is a limit to how much you can enhace someone who is born a normal human, The Emperor decided to `create` directly from Himself such godlike beings- The Primarchs. I see the process of creation in that order. And i don`t see a problem if both the Custodes and the Grey Knights are enhanced directly from The Emperors own genome.

The question is about the primarchs. Should they never have been taken and exposed to the warp in the firs place, I am almolst sure they would have been perfect and free from any human flaw. In the end it all comes down to The Emperor and the primarchs.