I agree, Evenepoel is a better rider than Onley and would have better chances. But my point is that if you take Pog and Vingegaard out, then the rest of the bunch is quite similar, and race becomes more open. Factors such as luck, who has a bad day and who doesn’t, who loses time in echelons, who makes a tactical mistakes and who doesn't, who is just lucky, how do team strategies change etc. who benefits from team tactics become much more prominent.
We don’t know what the racing would look like if you took Pog and Vingegaard out. Would it be basically the same—full gas from the bottom to the top? Or would it be different, more open, maybe more tactical, with more stop-and-go attacks, different attackers, and different counterattackers?
But overall, I am in your camp. I think that Evenepoel is capable of winning the Tour. But he is not a dominant rider (like Pog, Froome or Contador), where the question is not if they win the Tour, but when. Evenepoel needs the right circumstances and some luck on his side. Maybe it happens, maybe it doesn’t.