I haven't seen a ton of Kirk behind the plate, but it's clear to me that he's still developing and a notch below Jansen and the masturbator defensively. If the Jays were rebuilding, or if his bat wasn't so MLB-ready, Kirk would probably be catching every day in AAA this season.
I also don't think it's a coincidence that the one guy Kirk calls a good game with (Ray) has the simplest pitch repertoire. Basically: "throw the ball as hard as you can down the middle to get ahead, then wipeout slider for the K".
If he had a little more seasoning behind the plate to catch really complicated guys like Ryu and Berrios, or if guys like Springer didn't need the DH slot, he would've played a lot more. It's also clear that Charlie plays favourites (Espinal, Dolis, McGuire), and Kirk isn't one of them. Pinch hitting Kirk for a pinch bunter in a leverage AB really showed what Charlie thinks of Kirk.
I think next season, Kirk and Jansen develop into a very productive C/DH defense/offense combo.