I put silva just because of his 25 non-decision wins, only one of them is a submission true submission. (When I say "true submission" I mean due to a submission other than strikes) That's like have 25 wins by TKO or knock out.
If we really want to answer this question, we have to get Crocop and Wanderlei in a ring and have them beat the hell out of each other. It might end up like last time, when they drew, but it'd still be fun to watch.
Belfort got KO'd by Chuck and got dominated by Alistair Overeem. Vitor was a great kickboxer. Now he's beating guys like Yoshiki Takahashi and dropping fights to Overeem. I don't think Vitor would do so well if he ended up in the ring with the Axe Murderer.
Id say crocop would beat silva this time around, espesially if they strike alot without clinching. What about liddell? No one mentions him here? Wait for the WS CL fight, you all might change your mind!