I remember some grievance within the Ultramarines, Sicarius and Agemman were at odds with each other with Calgar trying to keep both of them at bay. It was the most human conflict I've ever seen in an Astartes Chapter.

"Killing" Sicarius off seems rather unfortunate, I wanted to see who won, if Sicarius or Agemman... after all, I think Calgar is due an heroic death already. He's a larger than life character with no distinct personality at all (like most marines, granted), but one whose death would mean something. Sicarius... well, not so much.

Also, now that Bobby G is back, Calgar's position seems a bit redundant, and his awesomeness and grandeur are diminished by comparison, which I find extremely, extremely sad. GW, kill him, for dignity, please!