The pundits have written AC off because he hasn't won the Tour since 2010 (dq nothwithstanding). They see Froome and Sky as indominable and Quintana as the next best rider in the world, if not the best pure climber. Then AC has been inconsistant since his DQ. He rode poorly in 2013, was super in 2014, was good but not superlative in 2015 and, what's more, took a real beating at the Tour.
He has been very good this year, as has been pointed out. But the impact of Froome winning the Dauphine and dropping AC on the queen stage, has fueled doubts over his potential to win...and rightly so.
However, looking at the photos of him at the Tour presentation, he looks lean and ready. He might just proove them wrong yet. Ever confident, Contador needs to respond well to Froomes attacks in the first week. If he does that then we might get a French version of the 2014 Vuelta. Of course, Quintana will add another dimension to the race, as well as Aru-Nibali, Porte, Bardet etc. So it's not just Froome, Contador needs to be vigilant about.