One-dimensional or not, I still think CC has the best chance of winning this thing. Cro Cop's TD defense has risen enough to where Silva won't be getting him down easy anymore, he and Barnett's fight will play out very similar to their last fight, and Nog only has a subber's chance again against CC (although he got it last time, and could definitely get it again). CC's biggest threat is going to be his cardio, I don't know if he can go two 15 minute fights.
Barnett I think can decision both Silva and Nogueira. He has better wrestling and is way stronger than both, and will most likely take them down and score points. I can't see him stopping either guy though.
I can see Nogueira subbing any of these guys, although a low chance against all three of them. Cro Cop like I said above will be hard to get down, Barnett is way too strong for Nog and his sub defense is good, and Silva's ground game is almost completely defensive from what I've seen (unless he's standing and trying to stomp a downed opponent in the face). I can see him decisioning Silva.
Silva... going to be hard as hell for him. His easiest opponent will be CC, since that's the only guy who's ground is possibly worse than his. The stand up war will be quite even, but I give a slight advantage to CC even though Silva has the better chin. I see both Barnett and Nogueira taking him down and scoring points, or doing the (seemingly) impossible and subbing him.