Horner also had some interesting comments on Contador's vs. Nibali's climbing strengths yesterday. He thought Nibali could go with accelerations but wasn't great at maintaining a really high pace, he'd slow down a LOT if he goes into the red. He thought Contador was better at accelerating and keeping a high pace for a long time.
EDIT: Here's that video: http://www.bicycling.com/video/chris-horners-gc-predictions#/video/all/created/d/1
EDIT: Here's that video: http://www.bicycling.com/video/chris-horners-gc-predictions#/video/all/created/d/1