It's like saying teams have to play game #82 of the NHL regular season better than they play the game #42. That's simply not true. In both cases, you fight through different circumstances, adversity, fatigue, etc. Austria, for example, is looking completely dead today. That's not them getting "progressively worse", that's them fighting the circumstances they are put against the best they can. The same applies to Canada albeit they face a very different set of problems. And it's not up to the coach (mostly) to magically make those problems go away.
Anyway, this discussion is getting nowhere.