Well, I am assuming that AD took this from fangraphs. Fangraphs gets their data from Pitch F/X. Pitch F/X uses an algorithm that, while continuously improving, still classifies some pitches incorrectly. Even when you know what a pitch is supposed to move like, there are still guys out there who are trying to zoom in on video of certain pitchers/pitches to see the grip they are using because the pitch is tough to classify.
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