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Q. Why would the Mariners want to deal, say, Taijuan Walker or James Paxton (in March) for Gonzalez, considering that those guys could be better than him anyway?
A. At such time as a Dustin Ackley proves it in the big leagues, even for a month or two, his value doubles.
The M's minor leaguers are as good as it gets. But they haven't jumped over the hurdle that Gio Gonzalez has.
The MID scenario: even if Gio doesn't get any better, he gives you 3.5 cheap WAR. There are a few guys who don't.
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Q. What's the worst thing about Gio?
A. Taro ain't going to like the way he carries his arm at the top.
The DWN scenario for Gio is for him to get injured. That's all. He already is a very good starting pitcher and he is going to get better.
... note, however, that Gio's velocity is up. He has gained velo steadily throughout his career, and he was as strong as a horse in August-September 2011.
The lower the through-slot, the better. Consider Randy Johnson's health. Human beings are designed to throw, sidearm.
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Q. What's the best thing about Gio?