Porte to come in 1st of the favourites, Contador 2nd, Valverde 3rd, Froome 4th. Not sure about the time gaps.
I think Porte is strong enough to drop everyone on the climb, but I'm not sure about his descending, if Contador has let's say a 15 sec gap at the top he might well take that back tll the finish. If Porte decides to go hard on the climb and attack relatively early, Valverde will have problems, I think he'll just let go at one point and contain the damage, maybe be half a minute behind at the top or 40 sec or something. Wonder what Froome will do, he might be dropped early and just ride his own pace to arrive a minute or a bit more behind at the top, or he might try to ride aggressively and hit the wall at some point, losing roughly the same amount of time in the end. All of that's under the assumption that we will see serious action on the climb. And I'm really not sure about the time gaps.