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James once wrote, "I've read everything Weaver ever said. Nothing in there explains how he kept his pitchers healthy."
Actually he did say what it was. It was that he didn't want his SP's laboring. The moment their MOTIONS changed even a tick, they were out of there.
But that's first principles to managers in the year 2015. How many times have we seen a pitcher's velocity drop by 3 MPH for TWO PITCHES and the manager sprints out of the dugout to yank him? Literally, two pitches. Boom.