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One reason to keep Walker is that his arm has virtually no mileage on it. He only pitched a couple of years in high school as basketball was his main sport. No college coach over-used his arm to advance his own career -- the M's have limited Walker's innings since he was 18 years old. His motion apparently is clean, causing no obvious strain. If there was ever a pitching prospect that was set up to avoid arm injuries and have a long career, it is Walker.