Basically they pissed all over Norwich that one time, best game we've ever played in terms of quality level IMO, and Therefore it's the best partnership. I do think it has the highest potential, again that game was otherwordly. But aguero/Dzeko is probably more consistent.
Though I think Dzeko is an extremely limited player in regards to what he can offer outside of goals, and although you can say that's all that matters etc.. Sometimes, when we're trying to play our way back into a game, his not being able to pass it to a guy 10 yards away from him does matter a little bit.
Tevez meanwhile, though his finishing has been mostly horrible this year, doesn't have Dzeko's lazy tendencies and is an all round better team player, the fact that he's got more assists than silva this season testifies to that, but I agree that maybe we should try playing him a bit further back. Coz his goalscoring really has vanished this season.
Personally I'd play aguero up by himself with 3 creatives behind him, Tevez, silva and Yaya maybe. With Milner and Barry holding, or if not then we need some new blood in the summer.