Don't rule out Nibali - he's not a bad time triallist and Saturday's stage finishes with the climb of, then long descent off the Joux-Plane. If he's still in touch on GC by then, who knows what madness he might attempt...
Amador looks dangerous too.
And Tony Martin appears to be in much better shape than he was early season. He's climbing well, we know he can do well in the TT, and in Chavanel he has one of the strongest lieutenants in the field...
d.