I think the staff made adjustments this season, but not to the 5 on 5 product.
The power-play is discernible different year over year.
The forecheck is the same. 1-2-2 with a swing up front and the expectation of constant pressure. Weak side D pinching is still something that happens even in low percentage situations. The defensive zone scheme is a puck-side overload but somehow twice as worse as last season.
So, the answer is yes and no to me. Did he change the power-play? Yes. Now, maybe that was Quinn. I have no idea.
But for my money, and from my vantage point, the rest of the soup has the same ingredients. Which isn't unusual. Look at a guy like Laviolette, or Tortorella, or even Guy Boucher back in the day. They have "their system." They are unlikely to change "their system." Either team deploys "their system" better, or they get fired. Because buying a coach in the NHL is essentially buying "their system" for better or worse.
NHL coaches do not run around from week to week or team to team and fundamentally make wholesale changes to their style of play on the fly. That is about the rarest thing you can see in the NHL. Sullivan made big changes during the Cup runs situationally, but that seems to have stopped.
I wrote a piece last year in December about how Sullivan had been deploying a deeper 1-2-2 without the swing and the heavy forecheck but that only stuck around a few times and we never saw it again, but it was so stark I highly doubt it was unintentional.