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Mariners are playing the Replace Iwakuma Game for next season, and that's fine. They'll have to replace Gallardo this season to because that guy looks like french toast. Gotta have a lot of stop-gap arms if this season is playoffs or bust as it should be with the core sans Seager aging out. Gotta have enough material for a mid-season upgrade too, and the farm is trash especially once Moore and O'Neill get here.
Taking a draw at having another arm that can start lighting it up isn't a bad plan. De Jong is one of those accurate 4-pitch righties who just got people out last year. It's a good back-end draw at the deck and didn't cost us much (at least from my biased POV).