I love Wanderlei, but he simply has no chance of winning the Grand Prix. He is definitely the underdog versus Cro Cop, and not only has to stage an upset to win, he needs to also stay injury free.
If he's lucky enough to be injury free, he will likely be more damaged than the winner of Barnett-Nog at least.
Whoever wins that fight will have a very easy time against Silva. Barnett will simply throw Wanderlei around like a rag doll.
Nog will take Silva down with ease, and probably submit him with an armbar or choke from Silva's back.
Now Silva certainly cant knockout Barnett, but I think he doesnt even stand much of a chance KO'ing Nog either... Nog's got a helluva chin and has taken way harder shots from Fedor than Silva would hit him with. So even if Silva gets past Crocop (probably with a gift decision from the notorious Pride judges) he can not KO either final opponent.
Wanderlei Silva has 0% chance of winning the GP, and anyone who disagrees is a Silva nutlicker. Fuck Silva at this point is a big underdog to Chuck "Frankenstein" Liddell.