The dude gets a ton of hate, but Gallant can coach. He will ruin a room, he will fight with GMs, but he will get results for a year or two that exceed what teams normally can do.
The big issue with New York IMO is they didn't really solve the 2C issue when their forward core was young enough... and now they are aging and on the precipice of a heavy decline. Lafs, Kakko, and Chytil have to step up in a big way this season. If it doesn't happen, they'll have to attempt a re-tool on the fly to open a new window with the defense. The bright side there is they should have a solid 4-5 year area to where an 18 month retool still gives them a bit of a window.