Of course the final matchups will play a pretty big deal. But I'm going with Cro Cop, I give him the advantage over everyone.
Nog - He's going to find it tough to get CC down again. And I don't see him winning unless he manages to get CC down and submits him again. Which is going to be a lot harder this time because CC's TD defense has improved and he has since gotten a BJJ coach.
Barnett - I see this going much like their last fight. I think Barnett needs a lot of luck to win.
Silva - Neither guy has good ground offense, I'm sure whoever is on the bottom is just going to hold until the ref stands them back up. And I think CC is going to beat Silva on standup.