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...I didn't know that B-Ref had Japanese league data...some of it, anyway. They have five years for Iwakuma...his last five. In which time he's posted a JPPL 7.1 K/9 and 2.0 BB/9 with miniscule HRs.
That would probably translate to a Chien-Ming Wang-esque profile. Meaning he'd have a few years before the league booked him and he blew up. That's fine with me.