Really? Alex? Havok was never the most important X-Men, why is Remender using Havok like he's the most important mutant.
See Remender's Uncanny Avenger for the answers to why it's Havok.
I've been reading Uncanny Avengers since issue 1 & only missing the latest issue 23 BUT i forgot why Alex too.
Alex is the leader of the Uncanny Avengers (and this event was mainly built there and in Remender's Captain America run). Aside from that, if you think about it, Alex is one of the five most important leaders in the X-Men. Sure he has always been under his brother's shadow, but that doesn't mean he's not important (and I love what Remender has done with the character, he's the only mutant leader I agree with right now, and the only one that really feels to be chasing Xavier's dream)
LOL, Havok is far from a top 5 leaders of Mutant kind.