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Don't forget you have another guy who they thought so highly of they brought him all the way from low-A to the Majors.
Wilhelmsen hasn't shown too much so far this year, but he also stated that he's never had a chance to find his rhythm and was anxious to get on a starter's routine.
You don't give a guy a shot like that unless you think pretty highly of his arm. And, even though he's older, he's still under club control just like any other rookie.