This 'Froome fades in the third week' fallacy needs to die. He was ill last year, hence losing some time to Quintana. But in 2013 and even 2012, he was strong in the third week.
He bonked with 5 kms to go on Alpe d'Huez, and lost over a minute. But he'd gained that on Quintana in the TT the day before (and had nearly 7 minutes lead on GC over both of them at the time).
This 'Froome fades in the third week' fallacy needs to die. He was ill last year, hence losing some time to Quintana. But in 2013 and even 2012, he was strong in the third week.