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I seriously doubt Kelley can hold up to the rigors of starting long term in the big leagues. HOWEVER...we CAN turn him into a 100 inning reliever and there's at least some chance he could stand up to that for a few years. If the Mariners want to go with 11 pitchers for a while this year (please let it be to keep Sweeney and not some extra middle infielder to cover their butts!), they need a couple of their relief arms to be both reliable and durable enough for 80+ innings and/or 70+ appearances. Kelley could be one of those. So could League.