I've seen some terrible looking fractures and dislocations. Coaches have walked away not wanting to look at it. A kid walked into my office who had torn off a piece of his ear from one of the rivets in his football helmet. It was a conversation piece for a while. A good many of these kids are looking to go on to college.
First priority is to grow and develop, then to excel in the sport and be the best they can be.
They are going to do everything they can to be the best. At this age, we teach technique. Plus at this age, it's competitive and so much fun. It doesn't matter if they start on the team or sit the bench. You watch them grow.