Board Thread:Warhammer 40k General Discussion/@comment-28917471-20140706092250/@comment-25149066-20140707222912

I agree that there was more too it. The Emperor made a lot of choices that had powerful repercussions later on. Leaving Mortarion and Angron to fester in anger. Not at least dropping a hint to Horus what he was going to be doing on Terra. Punishing the Word Bearers so harshly without any follow up lesson to make them see his way.

Back to the subject I think if Sanguinious became Warmaster Horus would start manifesting even more jealousy and spite. Could have created a different looking Heresy but may have still centered around Horus.