If anything, it's the opposite of bad coaching. A lack of fundamentals was not what caused the concussions. Back in the day, when you and I were that age, the coaches would have just told the kid to suck it up and get back into the game. Our coaching staff was trained to recognize the symptoms and took the actions to make sure the kids got proper treatment. And just so you know, the bigger, faster, size matters thing applies in the 7th grade too.