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How much has dyslexia disrupted his learning routines and the teaching practices around him?
Have his previous organizations treated him fairly and adjusted to his learning style?
And I also remember an interview somewhere (maybe Google Jeremy Bonderman dyslexia, I can't remember) that talked about how he needed to be 'shown' lessons, as opposed to explained.
IMO, there's a possibility that his negative learning experience may have conditioned him to not like learning in specific ways.
How does that affect his ability to learn pitching?