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Watched the video over and over and have to conclude that he's not pushing off (a la Koufax) and using legs as much as I originally thought. He's got a power torque in the hip flexors and a very efficient body rotation that obviously maintains his control. The one thing I like seeing from big guys is the ability to repeat said motion. Pineda has that. That short, exposive hip turn is hard to teach because his begins later than most and yet he still doesn't seem to be off-balance or putting too much strain on his wing.