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My position depends on one thing: that Zduriencik preferred Morrow to Jackson.
Jackson's $15.9m value in 2009 wasn't based on his first four months. It was based on all six months averaged.
Neither did he have poor command. His K/BB ratio was 2.30 to 1 for the entire season.
............
I'm not certain that his late-season swoon was fatigue, but it's about the most obvious pattern recognition you can ask for in a young pitcher whose IP have gone from 40 to 160 to 180 to 215.
It's not like his monthly ERA jumped up and down. He threw 25 great starts, and then boom, he hit his prior 160 IP marker, and all the rest were bad from there to the end of the season. I can't imagine what pattern you WOULD call fatigue, if this wasn't it.