Right, present Peter situation solved (I realised he survived Sylar going nuclear only after I posted). But future Peter... I mean with the Haitian gone, shouldn't all of his acquired powers return, including regeneration. Or is it like he needs to use his own power to use his acquired powers, but he can't do that because he's dead..?
In an non-related story - if Clair is killed next to the Haitian, will she regenerate when he's gone? Or is the only way to kill her is to remove her head from the vicinity of her body (like colorfully shown in one of the episodes..) I mean even if she technically won't die - it's just her head.. Not much she can do there..