I'm really curious to see Jack with the Canes. My mixed hope/fear was he was gonna do great in NYR playing in a top-6 of a good team with great talent, but he was very meh in the playoffs at least.
I think he could really be a great fit with the Canes system if playing to that system helps him with consistent compete and decision making. I never felt "effort" per se was a problem with him, I always got the sense he tried hard to be good defensively but would struggle to stay "inside" the game and get a bit lost and then have a momentary lapse or brain fart that would lead to bad things happening. The team certainly didn't help in that.
I can also see how trying to play the Canes system could really backfire with him, it's very demanding with the aggressive forecheck and covering for pinching D-men, if he struggles with decision making it could end up in catastrophic odd-man rushes and break-aways against.
EDIT: to add, no idea what role they are going to play him in, but if he somehow ends up with Aho, that could be great for him. Even Laine had a knack of making Jack look really good at times and Aho is way better at catering his game to his linemates.