Vincent Kompany is the only natural leader apart from Viera, but he's only been here 2 minutes and, for me and a lot of others, not good enough to guarantee a start.
De Jong is a fighter, as are Bellamy and Tevez but they're not captain material either. Bit like Shrek...
When Vinnie's fit I'd try Toure at RB, although Micah's been doing well recently but still doesn't seem fully over his knee problems.. but certainly better than Zab's been doing.
Be a decent back four then...
The other candidate should be Gareth Barry, but we've not seen enough leadership from him yet to give it to him... Which is a surprise and a disappointment because I thought he'd be a shoe-in by now. But he does play every game and has done better in the last couple, so maybe he doesn't need or like to rest. His consistency, when he finds it, will make him a candidate but not now.
The thing is until Toure's dropped, which he amazingly isn't yet, it's a moot point anyway!
But Vinnie for me!