i don't think its that surprising he changed his stance. winning a championship helps add a sense of completion and makes it easier to move on from. also, the rangers made it pretty financially appealing. and i'd imagine part of the sell was whats already in place, its in his best interest to make the jump to the pros and experience that now with a full summer to prepare knowing what that level takes. i never got any impression he had any cares about the depth chart, but i suppose the org may not have wanted to find out what could change there if they didn't get him signed sooner than later. i think the bigger incentive is because of said prospect glut on d, and assuming say 3-4 of the still to come guys track towards quality nhl dmen, which seems very likely at the moment - though nothing can be assumed from an org pov - there will be trades at some point. to that end, getting him in now, a head start on a summer into camp, gives them a significant amount of evaluation time. when the time comes, you want to know as much as you possibly can making those decisions. this means he'll almost certainly be in camp on the ice w/ nils and the rest next fall instead of evaluating from afar. so both sides ultimately benefit it feels like.
the one thing i'll say about him as a player is these fox comparisons aren't very close as far as how they play. they're both undersized dmen with offensive talent, thats about it. jones is a much more dynamic, or active player than fox. fox is all between the ears, he slows everything down, he executes fakes perfectly to buy time. he's a good skater, but he's not elite there. jones is way more active and fleet, but he's not where fox is defensively, and i'd expect a lot more adventures early with him. like k'andre although different in how they do it, his skating can cover for a lot of his risks...but in the zone i think there will be more issues for him dealing with nhl players. style wise i'd compare him to gostisbehere, who pre knee injury, was incredibly dynamic. he was a bit more refined coming out, but thats probably a better player to have in mind for him. to be clear thats not to put a ceiling on what he might ultimately become, though that would still be a solid return, just that whatever level he gets to, he'll probably look much different than fox doing it.