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The 225+ lb Garko has one of the lowest PX's in the major leagues. 34, 35, and 29 the last three years, with 100 being average.
He's never struck me as having Olerud-like grace, either.
Indians fans last year rated Garko as being remarkably slow (check first step and velocity).
..............
Just as a guess, I'd assume Garko is more like -10 or -15 runs per full year than -5. But who knows.