Yes, elite dmen can play those minutes and not make the dumb errors Bouchard does. At that point Bouchard had just played what 3/4 of the last 5 minutes straight? There was no reason for him to be out there and no reason for him to be overplayed that much but the coach chooses too. A guy like Bouchard at most should be playing 22/23 minutes. He is a 2/3 d not an elite number 1. You play a guy like that like he is that number 1, part of the consequences is more mistakes especially in a situation like Knoblauch was overplaying at the end.
There was no reason to put those guys out once the game was tied. Just take them off, put fresh legs out to drain the clock and send your top guys out in OT.