I'm guessing Matt's list is fairly close to being accurate.
Jay or Phil will have to have lifetime best insane conditioning to win. Phil might. I don't think Jay (although he is trying!) can get ripped like the other guys.
Kai's doing more to be accessible and fan-friendly than ever before, and is on PBW tonight. But genetics give him so-so shape compared to graceful guys like Phil and Vic. And Vic = legs aren't ready yet.
Favorite has to be Dex.