Judging by how downbeat Contador sounds all the time, compared to how upbeat Riis sounds, Kreuziger has got to be the card they play.
Andy afterall went on the attack in 18 two years ago as a set up for Frank.
Contador will be the one to attack early in the Alpes, when they think the sky train is weak, not Kreuziger. It will be left to Froome who will follow Contador each time.
Unbeknownst to Froome however Contador wont be racing to the finish line but just to the end of the climb, therefore going much harder, slowly tiring Froome out (they hope). After that Contador will just drop and go gruppeto. And Roman will have his shot.