One really epic power balance tipping entity that has gone missing in this whole saga is Legion (the fame and infamous omega level mutant son of Prof X). He might prove a valuable ally or extraordinary liability in this whole war with the Phoenix Force? Why isn't he being used? Won't someone want to broker his power?

Isn't he kind of nuts at the moment? I don't know his current status, but he's not "big" enough to be publicised in this event.

dont you have to bring Franklin Richards on the other side once you unleash Legion? It's better if those two are never involved.