TJ doesn't even care about Froome. He pretty much said as much. He's riding for third. Second, if he can manage it. No more. In any case I doubt he could drop anyone else on that group in the Alps. Rolland, maybe.
Nibali just wants to get something out of the race. A stage win, maybe a podium. Get a few licks in. But Froome doesn't really care (maybe about Alpe) so he can't help crack him. The most he could affect the race for the jaune is by getting his team to pace hard.
Contador is uber-competitive but he's also pragmatic. I wonder if at some point he'll give up the ghost. He already said that the little dig he gave yesterday wasn't just aimed at Froome. But yeah, for now he's the guy most likely to help Movistar. Only other guy who is even slightly gunning for first.
So it's really only Movistar legitimately challenging. On the one side I don't think they really care much about second place. They seem more than willing to risk it. And Sky seems interested in chasing down Valverde, so they definitely have that card to play. On the other side though Valverde has looked fresh he usually fades on the third week. And three minutes is a lot of time to make up. But yeah, hopefully they'll keep the race somewhat competitive. It was fun to see everyone take their digs yesterday, fruitless as they were. You know, if Geraint doesn't ride everyone off his wheel a la Indurain in la Plagne.