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I like the Harang comp, Taro. Their deliveries look very similar.
I did not see the kind of precision that Harang and other command pitchers have, though. I agree with the Doc that Lewis was not punnished in NPB for his mistakes with the fastball, especially.
I expect his walks to go way up and his K's to also take a hit. But your larger point is taken - he is an extreme bargain as a FA SP if he turns out to be league average. I would rather have Lewis at that price than Blanton at his for over the next three years.