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The randomness of clean contact on upward trajectories yields random finishing distances assuming solid MLB typical contact. The HR/Fly stuff doesn't work for pitchers because some are better at getting less than MLB typical contact on upward trajectories and the ratio varies for hitters but in characteristic ways based on their power. But you can correct for the statistical randomness in the same way.
Like what Michael Saunders did almost single-handedly for the whole team tonight. :)