Especially because, even if vingegaard were to improve and reach pog's climbing level from last year, he still has to ride him off his wheel. Just so much more difficult than for pog, who can take seconds everywhere (unless we still believe pog can 'crack', which i always found more of a hail mary than a foolproof masterplan even when it worked). Maybe his best chance is to smoke the time trial up to peyregourdes, but even there the climb is not that steep or long, so im not sure how much time you can realistically gain.
In any case, hope for a round 5 with optimal prep for both, we really need a credible challenger...