Barney i'll buy, but their is no reason not to tender Butt-era, need a 3rd catcher (to stash in AAA) anyway. But you're right, at $2M+, Barney will likely hit the bricks.
Then who is the backup? Assume AJ is retained, unless they go get Martin, they still don't have a 3rd catcher. Butt-era at just under $1M is better than most free agent options at that price. Now, if they go get Martin, they probably let AJ go because a $3M+ backup who can't do anything but walk is pretty useless, so you still need a 3rd catcher.
Ideally, we go get a starting catcher, preferably Martin, AJ is the back up, and Fed Ex is the third catcher planted in Triple A.