Board Thread:Warhammer 40k General Discussion/@comment-25149066-20140730083800/@comment-25177957-20140828194809

Fulgrim has been slaughtering even his own men for his and Slaanesh's pleasure, leaving the ranks of the Emperor's Children dwindling. If his little pleasure palace was besieged by Lorgar, Peturabo or Mortarion, he would crumble. And if these Daemon Primarchs were united to go to war against the loyalist Primarchs, then Fulgrim would stand no chance and would be forced to join or be enslaved.

He's also weak in the sense that he has no idea what's going on around the Eye of Terror, much less the galaxy.