Honestly no clue about that Edm trade lol, I'm not sure how badly they want to get rid of Nuge's contract. He's still a decent player, but probably overpaid a bit and they're gonna need space for Leon and McD, who will be their top 2 centers anyways.
In this deal they'd be getting a low first, a very good D prospect (in my book anyways, and who is only about 1 or max 2 seasons away from the NHL), a competent veteran 3rd line center for one season, and a speedy winger who could fit in well with their rush offense style. After 17-18 this move alleviates their cap and helps the blue line.
NJ badly needs to improve their D and also needs to add a bit of offense from the back end. Emelin at 3m and Beaulieu are upgrades on what they have. They might be able to do better elsewhere but who knows, and it still needs to be a team that Kovy would want to go to and I think he would accept Mtl to play with Radulov.