I find it funny when people say Buttle is a possible OGM candidate. That's ridiculous. That's just me though.
I think it could be either Joubert or Plushenko. If Plushenko comes back, then I think he would need a 4t/3t/3t to win over Brian Joubert and others without question, since everything else he does the other top men are capable of doing, as well (such as the 4t/3t, which wasn't as common, say, two years ago).