I posted this in another thread but seems relevant to the discussion...
2021
Stephenson
132 games played (80 starter, 52 sub)
102 games in the field (30 PH only)
Barnhart
116 games played (97 starter, 19 sub)
104 games in the field (12 PH only)
Casali
77 games played (55 starter, 22 sub)
67 games in the field (10 PH only)
Maile
15 games played (7 starter, 8 sub)
13 games in the field (2 PH only)
2022
Casali
57 games played (50 starter, 7 sub)
57 games in the field (did not record a plate appearance in 3 games)
Maile
76 games played (55 starter, 21 sub)
76 games in the field (did not record a plate appearance in 13 games)
Looking at the above, I do think there is a path to Stephenson starting 100 at catcher while making the other catchers a worthwhile investment. Maile starting 15 games and finishing another 20-25. Casali starting the remaining 47, getting 5 PH appearances and finishing another 5 games.
Stephenson 150 games (100 C, 50 1B/DH, 12 rest/DL)
Casali 57 games
Maile 35-40 games