What I find especially interesting is that the catcher seems to be able to catch all of those pitches, no matter what their early path. (Of course, the catcher probably exchanged signals with the pitcher, so he knows what to expect.) This makes me wonder if the batter would be better off adjusting his swing based on the position and movement of the catcher's glove, instead of trying to judge by watching the ball.

We already know that hitting potential can be predicted by looking for hyper-acute vision. Maybe having excellent peripheral vision is the difference between a good hitter and a great hitter, because the great ones use the catcher's glove information.