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The real story? Perhaps it was just because Iwakuma was still recovering from an injured shoulder.
Wasn't the teams handling of Iwakuma exactly the right way to allow him to regain strength and return to full health? Unlike what we saw with Carp, the team started him off slow with limited game use and worked him out in bullpen sessions, stretched him out to start and has babied his pitch count up to this point?
Seems a more likely scenario to me than some form of prejudice or bias.
- Ben.