I've seen it argued that at Wigan, everything ran through CNZ. He was the fulcrum of the attack and was the centre of attention. He flourished in that role.
At Villa, he is one piece of a larger puzzle.
For whatever reason, he's regressed as a player since coming here. I still think there's a good player in there somewhere. I'd give him till Jan to prove himself. I don't think his valuation can drop any more than it has since he's signed for us, but it can rise if he puts in the performances everyone is hoping from him.