Board Thread:Warhammer 40k General Discussion/@comment-6767898-20130227013545/@comment-7186329-20130319202504

The Imperium NEEDS the codex rewriten, or atleast improved. For that reason Guillman is one of the primarchs that are most likely to return, or get cured in his case because he is crucial to all codex compliant chapters.

Your theory makes an accurate statement base on wrong observation. There is no gene seed flaw with the Ultramarines, not a significant one atleast, and it is quite stable. The flaw comes from their predisposition to abide to the codex absolutely, because otherwise it would be `disrespectful` of their primarch. It is as Sindri Myr said, they are unable to adapt or think outside of the codex, and that can ,and has proven lethal. The Ultramarines owe it to Marneus Calgar to be the firs of them to think outside the codex in a long time.