For any interested nerds:
D1baseball has started sharing advanced defensive stats (DRS) this season. If you recall, Cameron Gill was ranked super highly last year at Wofford.
From looking at the data, I think it's because DRS is purely derived from synergy / pitchfx style stats -- so for catchers, the only metrics are on pitch framing (which can easily be derived from pitchfx data) and preventing stolen bases. both gill and ballestero rank solidly in DRS. Ballestero is allegedly really good at pitch framing, and Gill is decent and framing and good at throwing. Catching the ball isn't part of the equation.