Even for a rider and fighter like Contador, it must get harder and harder to sacrifice for one more win - he's won so much after all. I have wondered whether what happend to Porte this tour, and the crashes AC has had recently, have also taken their toll on his motivation and mental energy needed to continue. And perhaps there are family reasons we'll not know about. He spent a long time living in a place he didn't much like, and even though he's moved back to Pinto, the amount of time away from family must get wearing.
Whatever - I only hope he won't disappear. He's been a big inspiration for me.