I don't think it's explosiveness. He just doesn't have the relative power over and over again to match MVP and specially Pogacar.Van Aert is mostly explained by his ability flattening out earlier than some others due to Visma being further ahead of the pack in 2020-2022/2023 than they are now.
And it really doesn't help him that Van der Poel and Pogacar are just more naturally gifted at RVV. Van Aert doesn't really retain the explosiveness super deep into a race.
Oude Kwaremont is not an explosive climb and he was dropped there in 2021, 2025, 2026.
