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:daps: absolutely it's an open question how well any reliever's arsenal would hold up to 35 games x 100 pitches' worth of exposure.
This last game, they didn't get a finger on his offspeed pitches, and of course nobody sustains that kind of performance with any pitch.
The fact that the hitters were whiffing on stomach-high tubed changeups doesn't tell us that they'll always do that; it tells us that he's got some smokin' arm action goin' on there.