If you aren't starting him, you might as well trade him for value, because you aren't getting equivalent value with him in the bullpen.
People worry about injury risk if he starts. What about the injury risk of him closing? Relievers that throw very hard tend to burn out quickly, with a few exceptions, Wagner being the first guy I thought of. Most of the guys who were successful in that role long term weren't blazing fastball pitchers.
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