The devils have a much better and deeper defense than the Panthers did and they don't give up much at all. Their only apparent weaknesses are in goal (which having a good defense corps helps), their size (which is also part of why they're so fast), and their youth.
This year's devils are much more like last year's avalanche than last year's Panthers.
To your question, I'd like to see player much closer together on the ice, ala the Kings of their championship years. Sutter style would be great for this team. I wouldn't want trotz bc I think he's very overrated but Babcock is the coach I'd go for. Get your players always keyed into being available and supporting the puck carrier in all zones. Nobody on the ice should be waiting for something to happen. If you don't have the puck, run a pick, slow the forecheck down for your defenseman, move up the ice with as many players as possible.
Couple things here. Agree on the Devils, if anything unravels them its going to be Vanacek and Blackwood, not the rest of their roster, which is constructed very, very well.
Agree on Trotz point. If we want more Goodrow and Vesey top 6, we may as well just keep Gallant. Trotz stapled Komarov to Barzal, yet because the Islanders got INSANE goaltending from Sorokin and Varly, everyon heralds him as GOAT coach. He's a good defense oriented coach, with strong systems, BUT has many of the same flaws that Gallant does in terms of lineup decisions and player deployment. Good coach, you don't have some of the success he's had by mistake, but overrated, yes.
I also think there is this MASSIVE misconception between systematic play and accountability. We can get a coach with the best X's and O's ever seen to mankind, but if he resorts to Goodrow and Vesey over Laf and Kakko as his blame game and changes to hold the team accountable, we are no better off. The issue lies in our top guys not buying into systems.
Now, Gallants + is hands off, so he does not place a ton of emphasis in system structure. So if he can't get his star players to conform to a system that only slightly changes their play and doesn't ask them to do all that much to sacrifice points for team, whos to say someone coming in to put a defensive structure into place will help?
The focus with this team should be less on exact X and O's system and more on, teams go as their top guys go so heres your wakeup call. A coach who is going to have consequences for the stars who neglect to play as such. Theres your pipe dream folks, you want Panarin and Kreider waiving their NMC's? Bring in a coach who is going to push them to be their best and they will either answer the bell or break and waive the NMC for a trade.
I'm not advocating or hoping they do that of course, but what I am advocating for is a coach who is not afraid to lay the blame squarely where it belongs, at the feet of the highly paid underperforming stars who neglect to play straightforward hockey, no matter what system its within.
Offensive system, defensive system, whatever "type" of system it is, accountability is needed. Thats where the focus should be.