This is the type of compartmentalized thinking that leads bad teams to do misguided things like trade for Michael Morse because their lineup really needs a "right handed power presence".
It doesn't matter that JPA has power and power is less common in baseball than it used to be. What matters is that JPA is a poor hitter, all things considered, and a fairly terrible player.
He was an above average hitter for the catching position from 2011-2012 (pretty sure), and he was still, quite easily, a below average catcher overall.
Players don't get much more expendable.
If you can get something back for JPA's "power", then it's a no-brainer... which is convenient, because I'm not sure how many brains are left in the Jays FO.