Ferminal said:
So even if there was a tailwind there, they definitely did not take advantage of it (which is of course why proper analysis should only consider the climb from Saint-Esteve).
But if we discard the first part of the climb from the analysis, then the remainder of the climb should only be compared to ascents of similar profile / duration.
You can't meaningfully compare the final 14k segments of a 20k ascent, as in one ascent the riders may already be working hard and in the other they may be barely more than ticking over.
It's a bit like trying to draw anything too meaningful from who rides the fastest second half in a pursuit. If you've ridden the first half balls-out, you will ride the second half relatively "slowly", but could still beat a rival who coasted in the first half before blitzing the second half.
I'd also dispute the claim that the riders didn't take advantage of the tailwind early on. They can't not have benefited from it unless they rode with their brakes on. For a given speed, even a relatively low one, the stronger the tailwind, the less a rider has to work and the harder they can ride later on.