Evans is usually rock solid. If his form stays the same, he could be a real threat. Nonetheless, there is only one, short TT were he can take time.
Valverde is the better uphill sprinter and could take back time at the finishline by beating Evans. He usually has a day where he loses time in the mountains. Consistency?
Sanchez finished before Valverde in the 2008 Tdf, should not lose too much time in the TT and has an acceleration to attack in the mountains in the last 2-3K. I think he could be doing better than Valverde.
Basso proved in the Giro this year, that he is Steady Eddy as well. The problem is, I don't know where he will take time. He usually surfaces because others fade. Could he do something on the long climb to Sierra Nevada? His team today consisted of Szmyd only, no Kreuziger. How will he make his team set the pace to atrition, if it's only him and Szmyd?