Pogacar put almost 80 seconds into Roglic on a 20-minute climb of Peyreguades (fresh TT effort, it was considered a good performance by Roglic), which is more or less consistent with those w/kg differences. OTOH only 68 seconds on a fresh 55-minute Ventoux climb was much smaller than average (maybe rest day after Pyrenees did its job, while Peyreguades was after difficult Hautacam day).
We have already speculated about Ventoux (and longer climbs in general) erlier in the thread. The w/kg differences also do not specifically refer to fresh efforts, where the gap between the two should be slightly smaller on average anyway. Possible reason for smaller differences on Ventoux:
-Roglic had his best day of the year, better than Peyragudes in my Index
-Pogacar did not go as fast as possible (irregular pacing) and probably had an average day
-Gaps on long climbs seem to be smaller in general (%-wise), especially on Ventoux where the first 10 minutes are always in a bunch. This already reduces the potential gaps at the end.
- Pogacar may be relatively worse on long climbs, while 20 minute efforts are his bread and butter
Edit: And if you just took the time from Vingegaard's attack, it would a 68 second gap on a ~23 minute effort.