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I've been seeing the same thing regarding Zunino's D. He sure seems to miss a lot of pitches this year. I remember when he first came up, he was positively catlike back there. Now he seems a lot slower and less athletic.
Could it be that he came up so early? Maybe we were given unduly high expectations based on watching him play significant innings as a 22/23 year old. Could be that catching has sapped some of those young-man's juices and slowed him down a touch.