how is that awesome? imo, thay makes it overtly stupid. as long as one cell is alive you can regenerate but if something is stuck, that's it? why can't it be pushed out like the the bullets with Sylar. wait...that kinda, coulda been his TK factoring in. but still one of those bullets made it to his heart.
with matt, i don't think he used the african's power as his own, i think it's the african's ability to bestow vision. something like a vision quest. he did give matt something to drink right after he ate that patse stuff.
also, i think peter has the haitian's power but just doesn't know. he has been seen in the past to be surprised at which powers pop up at the most convenient times. who's to say that whenever the situation calls for it, the haitian's "lil' mickey" won't rear it's ugly head.