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Maybe, but thats debatable. His Strike% was identical from '04-06 in Seattle compared to '03. His HR/FB was high in '04, but also very low in '05 and average in '06.
The 1mph loss in velocity definetly didn't help.
From '03 to '04 he losses 1mph in velocity and goes from TOR to BOR. Perhaps his command also suffered though we can't tell from strike% and can't tell from HR/FB (either than '04).