I see 6 teams who could be in the market for a catcher. BOS ATL LAD CHW ARI TEX Boston and Atlanta would be if they don't yet want to turn over the reins to their respective Christians. (And ATL has to be set on moving Gattis either to another team or the OF) LA now employs the GM who ran Jose Molina's anemic bat out there forever due to his pitch framing. The White Sox seemingly still believe in Tyler Flowers. Arizona has absolutely nothing at catcher, but it would seem strange to me that the Montero trade wouldn't have been expanded to include Castillo if they wanted him. Texas started TT's favorite playing at catcher for half the season, but he actually did a cromulent job at it. So we need to rely on teams -Not valuing pitch framing the way we apparently do -Not believing their young catchers are ready -Believing Castillo would be a good mentor to said young catchers -Not seeing Geovany Soto as an equivalent option -Believe that they can be competitive this season to the point that it makes sense to trade prospect(s) for Castillo(Neither Arizona nor Texas have shown any signs of adding pieces this offseason) I'm not optimistic.