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When you say "finality," my question is why they don't want to *investigate* Kelley as a starter.
As an RP, I don't doubt that his pitches past 30 will split out weird. The question is what happens when he's stretched out to start.
............
Kelley *could be* a guy who lacks stamina. "What exactly" is the fact that a pitcher with plus-plus command necessarily has good driveline mechanics and usually has a starter's rhythm. But nothing's for sure.