Of course, when a coach implements a tiny tweak that derails his best players, it's also expected that the coach improve.
What we see is bigger than Kuz simplifying his game. There is an elephant in the room you may not be seeing. We are blowing the leagues best teams out, and shutting them out. All of a sudden.
That elephant? The system is simplified. Barry abandoned his directive to win games by wearing out the opposition defense. Which led to some nice 3rd period comebacks, but never when the games counted most.
Here's what I see:
As we've discussed they're 'funneling' more and looking for the shot. But that's not the main component. Their system and structure is much more orderly (but flexible) and apparently built on a few simple concepts that allow them to react quickly and play more in a flow state, imo.
I think they're looking to play more of a 3-man game up and down the ice, essentially creating triangles of support especially along the boards but with the goal of "weaving" or getting off the boards as soon as possible. Notice how easily they're exiting the zone AND making it through the neutral zone AND gaining the offensive zone while carrying the puck. This is because they're not just circling around or streaking down the ice hoping for a breakaway while the defenseman is being forechecked. The d-man or whoever takes what ice he can with the puck and finds the NEAREST support player unless there's a clear breakaway pass. Then the passer and another player further support the new puckhandler. The 2012 Bruins were masterful at this.
All they have to do is note where their teammates are and find the third point on the triangle to fill that space. Very simple. Or, if it's just two guys and a man needs help, find the third spot in relation to the puckhandler and the defender to create the support necessary via a passing option while being close enough to defend if necessary. You only have to find your closest teammate and beat one defender on foot or with a pass/chip.
This system fits Kuz perfectly because it means he can do what he does best (find space and find players nearby who are themselves entering space). I don't think it's a coincidence that they began practicing this kind of triangle setup in December, with a forward floating up high in the offensive zone to support the d-men at the point (e4k confirmed they were practicing this when he visited Kettler).
On defense when they do this it almost looks like a 3-2 or 2-3 basketball zone until they start breaking off and covering puckhandlers, then it looks like man to man or a hybrid system. I think they're still looking to maintain spacing to provide support.
But all of this only works if they have players who buy into it and give the right level of effort throughout the shift. That's exactly what's happening now. If the overall goal is to keep filling those spots and supporting each other while looking to get shots from it then there is no more "turtle" unless you slack off. There are only more and more chances to score, which they're taking.