I hope high school guys reading these recent posts are picking up on a theme....I went to college and lost velocity. This is the problem with cookie cutter programs and coaches willful ignorance. It is very common.
I would ask about mechanical changes, maybe not intentional, that occurred after the injury. My son hurt his elbow skiing and pitched dinged up senior year of HS. He didnt have much pain but developed a habit of throwing across his body after his elbow. The body will compensate for injury, weakness or instability. I would ask about weigh loss. Just a couple of ideas.