my bet is on colombian guys, betancur could do best of them. There is only question if he can hold his shape till late september.
I'm quite curious, how sagan will show there. His team manager has been talking about some special training in US to get him in shape for WC. If he's there in the end, I'd be surprised, however not being a favourite for a change could suite him well. I think it will be all about how hard will the race be made by the climbers, especially nibali, spanish and colombian guys. If they just watch each other, then they could very easilly be surprised in the by some puncher, especially with somebody with excellent descending skill, like Sagan in example.