I said it in the Ronde topic, and I'll say it again: this was, physically, the best version of WvA, and he lost because 2 guys were better, and Pog's KOM on Kwaremont proves this isn't because WvA was weak, but because Pog set a higher standard.
Still, WvA makes small mistakes that, in this race, cost him the podium: he wasn't mentally prepared for a MvdP attack on Kruisberg, and he rode naively thinking MvdP and Pogacar would work with him until they caught the breakaway. That didn't happen, because MvdP has that killer instinct (and ofcourse a bit better legs at that moment). I already noticed on the 2nd Kwaremont, that MvdP only followed WvA's wheel and didn't bother too much trying to force it on Kwaremont to counter Pogacar. People thought MvdP maybe didn't have his best day, but ofcourse this was MvdP playing the game of waiting, pretending he isn't the strongest,... He does that so well and every time WvA seems to take the bait. There was another strange moment when Laporte drove to Pogacar and started working. In hindsight (but at the moment as well), it looked stupid to give Pogacar a bit more energy this way...
If WvA rode it a bit smarter, he wouldn't have worked as hard with MdvP and Pogacar until the last Kwaremont, as he had a team mate up front (MvdP didn't, and Pogacar was clearly very eager to win the race and wasn't counting on Trentin to do so), and he would have been a bit more into saving mode + more attentive on the climbs, so he would have made it with Pogacar and MvdP to the Kwaremont. If so, he would have probably finished 3rd, solo. Ofcourse that's hardly better than contesting the sprint for 3rd, but it also goes to show that even with perfect tactics, WvA was doomed to ride for 3rd place in this race.