maltiv said:
Rodriguez did the climb faster last year.
It was a cagey and fairly gentle ascent this year until about 1.5 to 2kms to go - so it isn't too amazing to have had a quicker time in the past. I sincerely doubt Rodriguez did the last km faster last year (although I would like to be wrong in that - suspecting folk of serious levels of doping gives me no pleasure).
Under the 1km banner Froome & Cobo were about 2 seconds ahead of their pursuers. They ended up gaining between 19 & 37 seconds on various competitors in that last km alone; including Mollema, Wiggins & Menchov* who are all in form and will have been desperately fighting to try and claim or defend key GC positions (i.e. podium or top 5).
Compare that to Froome's finishes in the short sharp finishes of stages 5 & 8 (that Rodriguez won). There both Froome (and Cobo) showed little or no sign of such explosive ability over a broadly comparable 500 to 700 metres burst on crazy gradients (although admittedly preceded by flat rather than 5kms of ascent). Infact, on those stages, both trailed in behind the likes of Van den Broeck, Mollema & Menchov, languishing down in positions between 18th and 25th. Yet about 10 days later those two riders have utterly decimated the rest of the field on similar terrain. An incredible change of form for all riders concerned, particularly when you consider that the form of Wiggins, Mollema & Menchov has arguably been fairly consistent throughout the event.
*I will concede that by doing some pace setting up the climb Menchov may not have been at his freshest to make an attack, but his pacing didn't seem too taxing.