Board Thread:Warhammer 40k General Discussion/@comment-6767898-20130227013545/@comment-7186329-20130327140204

To `Dodge The Bullet`, please read the entire discussion so that we avoid repeating what has been said. The Ultramarines gene seed is quite stable, with no significant deviations, it is a psychological factor that determines their behaviour.

If Guillman does return, and actually create a new codex astartes some chapters, ultramarines most notably, could have trouble adapting and changing their tactics and mindset. That attempt at change could prove disastrous if there is not enought time for the chapters to adapt, and the sudden change of overall tactics might lead to disagreement within the chapter itself, if there is not someone to act as a sort of mediator between the change of the new codex and the chapters.