If TJS is a real possibility then Sale must know he has, at best, a partial tear or scarring from the prior damage and then the PRP stimulated regrowth. If that is what is making his elbow or forearm sore, he needs to pitch through it. But if the MRI's show some partial tearing, it , for sure, won't heal itself in a week, 10 days, or 12 months. If partially torn and given his radical throwing motion , it will blow sooner than later. He may well be reluctant for surgery and rehab, but also doesn't want to be the one to blow it out himself.
I'm sympathetic with others who have said that if he was allowed to throw from sometime in November, how did he or the team let it get to a BP session in March to suddenly get sore ?