It seems like it's headed this way anyway, but Jansen needs to be the starting catcher with Kirk playing a lot less. As mentioned he's been well below average offensively since July of last season, and he's somehow morphed into a singles hitter which is not good for the fattest/slowest player in the league. As a backup CA making the minimum, he's fine, so it's not hurting to have him on the roster, but if July 2022-onwards is his new norm, then he's not a starting caliber player in MLB even with his good defense. Have him backup Jansen for now and if the bat starts to come around again, then adjust playing time accordingly.