The trading of Warren was a head-scratcher, but as in all these case, there is method in it. And I think this had something to do with 40-man roster jockeying.
Regardless of the closeness of stats, the Yanks do have a superior bull pen in the sense of shut down guys. We bitch and complain about Kelly and Barnes and then have the nerve, after a win of course, to proclaim our bull pen all but equal to the Yanks. I also think that Zach Britton is only going to get stronger with work. He's still in his pre-season. (better say tho that yes yes we are stronger in starting rotation---no no doubt)