The Grand Colombier via Culoz has a couple of ramps that make it harder, but it's similar to the Montee de Pipay. Pinot bludgeoned a lesser field into submission at the Tour de l'Ain, that's the kind of climb for him. Quintana should be the favorite based on past performance in such climbs.
But everyone seems to overlook the last stage, and its finish could see riders like Yates and Birdsong punch it hard. Or some rider who wants a thread stating that they are "The New Carapaz". When designs make for small gaps, as we saw in Italy, these things can happen.
I think that the four riders I mentioned will top-4, how they play their cards can be very interesting.