Virtually all of the nominees here have already been covered, in one or more of the previous awards, which is fine by me, as I just get to copy/paste the paragraphs from those nominations!
Castillo saved the Diamondbacks from perhaps the ultimate Gurgling Vortex of Suck offensively from the catcher position: on Opening Day, we were looking at Tuiffy Gosewisch (career OPS+ 41), with backup up from Gerald Laird (74). But Mark Trumbo proved useful after all, turning into a couple of prospects and a catcher who hit the snot out of the ball.