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Iwakuma is a top 10 NPB pitcher, but stylewise one of the safest bets to transition over and maintain his success. Hes as safe a bet as Kuroda was.
The only question is health (not a safe pitcher) and how 4 days rest and a longer schedule will affect his sharpness.
NPB transitioned to the MLB ball in 2012 and we saw guys like Aoki and Nakajima implode. It should give us a slightly better idea of how guys will translate.