Speaking for myself, it is odd that Vavra was getting ABs and corner OF starts over Stowers against RHP. But you are right, if the org views Vavra>Stowers vs RHP (which they clearly do), their only options were to let Stowers ride the bench with the big league club or let him get Triple-A reps and let an O'Hearn or Cordero occupy the last spot. Both of those scenarios are forum panic-inducing, although the former is less so. The real question is why they are seemingly bearish on Stowers...
But how long will they ride with three catchers, and who will come up when Bemboom gets sent down? The extra catcher was nice the other day when they were able to pinch-hit for McCann and keep Adley in the DH spot, but the third catcher is pointless when Adley is catching.