I'm not sure he's for real.
If he can continue as he has done this year, the deal will be much better than I originally thought, but TK had a WHIP over 1.500 for two straight years. Maybe 2017 isn't a fluke, but I wouldn't cringe, if the Yanks bring him in to face Betts in the playoffs.
I'm looking through the eyes of a Sox fan, and I think this deal would not have been good for us, IMO.
It might end up helping the Yanks a lot, or it could barely make a difference this year but hurt your future.