Well, I certainly may have misinterpreted or not fully understood the terminology in your first post regarding the prognosis. And, since I replied early, I may have led the thought process here down the injury path... apologies if that is not correct. Of course, I defer to the medical expert in this situation. You said specialist... if you are comfortable that she has reasonable experience with sport/throwing specific injuries, great. If not, a second opinion with a sports ortho with that point of emphasis may be something to consider. The recurrence (among other things) still raises a red flag to me.
Hoping for the best for him.