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Since you pay close attention to this factor, the updates are very interesting.
Maybe NPB pitchers tend to take the mitt as a "command." In MLB it is more like a "suggestion." Felix doesn't especially worry about hitting the mitt - he throws to the spot he wants.
If Iwakuma wants a shuuto at the bottom of the knees, and Montero hold it at the top of the knees, Iwakuma will "obey" the catcher's target?