Not a bad supposition. Managers often hesitate to use the last catcher as a pinch-hitter. That's not an issue for most teams because the backup catcher usually doesn't hit much, but in our case, having Larue or Valentin freed up for pinch-hitting duties could help. Let Ross be the 25th guy every day instead of a guy who can actually hit.
I still think there's a good chance a catcher is traded, though.