I agree. Buff is a great talent, very unique. I said many times his value would be in a team competing for the cup. But the ins and outs of an 82 game schedule with a team that struggles just wouldnt interest him on a day to day basis.
It has to mess with his team mates though. Even if it doesnt bother them personally, when he plays his lazy "bad Buff" ways, it has to screw with the others' focus on defensive systems.
If there was a connection between Buff and Trouba, whether it was ice time, money or just the idea of being the defensive Captain, I'd endorse trading Buff and giving his money to Trouba on an 8 year deal. You're still going to get a big return for Buff. if Vegas had cap space, he's look great there, though I doubt he'd waive his NTC to go there.
Jets are unlikely to trade him though. So, what happens if he's pushed down to 3RHD and plays 12-15 minutes a game. Does he become a distraction? Does he then request a trade? Does he play great and try to work his way back to 1RHD?