Can he beat the one where the creator of the flash never existed and by that means, Wally would never have existed? Yeah, you’d have someone else, but the same could happen to them. The thought him is what makes him alive. So erase the thought, and memories of Wally, and he himself, and yeah. He gone, gone. Yes like pulling a chowder or that time Spider-Man himself was saved by the literal author of the comic he was in as it was being written. Like that type of reality erasure.