A fresh Sancho is much more effective than a tired Pulisic, whom probably shouldn’t have started the game. With the defensive attention he faces, he needs to be at his best or he spends much of the game being dispossessed or looking for fouls that aren’t forthcoming.
Yeah, I do think there were some uncalled fouls but I also thought that the ref established really early - like in the first two minutes - that he wasn't gonna be blowing the whistle for anything other than pretty obvious fouls. In that situation I'd say he's probably got to recognize and adjust.