I am still hopeful that giving Graterol such a nonspecific diagnosis reflects a lack of anatomical injury on MRI (i.e. rotator cuff tear, labral tear, etc). It certainly could be that his shoulder hurts when lifting his arm above his head, probably common in pitchers and any other overhead arm use profession, and this is a good opportunity to shut him down to rest. I predict he will be back pitching later this season, and will be called up to the Twins for our playoff run.