I'm not a doctor, so I'll leave it to the medical profession, but my understanding of elbow problems are that they don't respond well to rehabbing, because tendons and not muscles are involved. Rest might help, but if you are a pitcher that has recurring elbow issues, you are probably headed to TJ surgery. Get rid of him. He is a sinking ship. Granted that it would be hard to do worse than this season, but I don't see him as being a productive member of the rotation going forward.