It’s definitely not a necessity but Kirk is a bit of an enigma on the current roster.
On one hand he could easily slot in as the DH most days while catching 2x a week which makes him a valuable player.
On the other hand he’s quite expendable under the current roster construction because:
A) you’re dealing from a surplus of catchers
he’s probably the worst defender of the three
C) he’s the catcher who holds the most trade value
D) he’s a proven major league commodity and young catchers are hard to acquire
Kirk can be dangled as part of a package for an SP or an infielder and the Jays can roll with Jansen/McGuire to start 2022. Jansen’s strong finish and great D give a lot of people confidence in him to be an average catcher at least.