Werenski hasn't had much "jump" for a while now. To even play 21 minutes a night, at this point, he's got to play it cool and conserve energy. You can see him floating back if he's behind the play on a rush.
I'd switch him with Murray at 5 on 5. As much fun as it is to see Werenski play such a big role, and to do okay at it, I'd rather see him dominate lesser minutes.
That is exactly what I'm suggesting. Let him focus on running the 1PP, and have a few more minutes of 5v5 on the bench, talking with the coaches, catching his breathe etc.