It was a bold move from Alberto trying the double and as everyone in cycling said if anyone was to do it its only him which is capable of it but this field in this years tour is to much im afraid for the greatest GT rider of our generation. Well gotte give it to him atleast noone else bold enough to try and afterall as he said a single TDF victory alone is not enough for him maby not so suprising when the guy has won 10 (7) GT's
The commentator I'm hearing says Sky's method is constant rotation so maybe they literally show Sky when Froome is on the front rather than he is actually there the whole time.