Just give him more time. Eventually we’ll understand what his system is.
System is pretty easy to understand. 2-3 forecheck in OZ. 1-1-3 in NZ. Box+1 in DZ. That's the meat and potatoes of how they play off the puck. All systems have their nuances and heavily rely on players to read and react. Opposition and game flow will also have tweaks but that's the basis of what they work off of. You may not like what they utilize. I'm not very fond of some set breakouts, specifically how frequently they look to get the the wingers high in the NZ but it can work and plays to the skillset of a player like Stutzle, who is a primary play driver.
I don't understand the talk of no system, no structure etc. It's so shallow and for me doesn't get to the root of the problem. I don't care if DJ is fired, I have no allegiance to him. I would agree that it's time for a someone else behind the bench but I don't think any coach walks in with same cards dealt to him a plays a much better hand. The players need to be better, so many issues from this season arise from decision making rather than the system.
Take this game sealing goal for example.
Maybe Pinto is a little too high and gets taken out of the play with a nicely drawn up and executed pick. G should have stuck with his man better but what the hell is Brannstrom doing conceding so much space inside his blueline. You are defending your blueline, you can't give up that much space. Force a play at the blueline rather than trying to pick off a play inside the zone. This isn't an example of bad coaching or bad systems, it's simply a player not executing. Far too common of an occurrence.
Here's a closer example of what it should look like, though execution is still poor
Stutzle who has the middle lane, steps up and forces a play. He isn't able to break up the play but Zub who had the outside lane has dropped in support and is able to recover. In the end it doesn't matter because a high risk play by Stutzle results in chasing because that's what turnover frequently do.