Except one is an over the hill pitcher that has pitched his best baseball in 3 years and is an impending FA. The other is one of the best bats in baseball on a reasonable contract, controlled for another season, and has the ability to get a comp pick out of in 1.5 years. The gap in value is significant, despite what bWAR and fWAR say.
I'm not saying that Jose is going to command 2 top 50 prospects, but if he doesn't command at least 1 and another solid flier, he just simply isn't going to be traded.