A former teammate of my son finally injured his arm. After throwing CBs since 9-10 yo. He did so in his 3rd year of college. Rehab only. His dad was the coach of one of my son's teams and he like my son was a junk ball pitcher. His doctor and my son's doctor got him an MRI and he needed rehab only. Took all of last year off after throwing only a couple innings. No cummulative damage, no wearing down of parts . solid shoulder etc.
Injuries happen and it is not the end of the world for most pitchers. All these stories had me almost getting a hanky out. Knock on wood my son is at the hight of his game. His only complaint is he is not getting enough innings. If he gets injured he will do what all injured pitchers do. Work his butt off to get back on the mound.