Maybe the grupetto rode a few seconds faster in the final kilometre as well. Who knows? It's irrelevant though, they were already dropped. Just like Evenepoel.Evenepoel had some help from Cattaneo (or Hirt?) the first km or so after JV's attack, but then had to do everything himself. Roglic and Vingegaard had each other plus Valter for a while. Still Evenepoel, but also Ayuso and others (bar Mas) managed to actually claw back time towards the end. Which tells me that at least Roglic and Vingegaard are not head and shoulders above the rest.
It's clear Evenepoel found a second wind toward the end, which is not unusual for the time trialist-turned-climber he is. He can't go too deep into the red. But he couldn't follow when it mattered.