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The last few years, we have been told that catchers learn more when they are NOT playing... but instead with their work on the side. In fact, I remember it being said that games got in the way of the training.
Since we already have 2 catchers, then all Zunino needs to do is catch when there is a lefty starter, be the 3rd catcher on the bench, and learn in his side sessions.
I see this as a no brainer, but...