It is the first thing I think about when someone's behavior changes and they play football or when there may be multiple instances of them getting in trouble for alcohol drug related issues. I don't see why saying I hope it isn't CTE is a bad thing? Maybe you don't understand that is not saying he has CTE...??
Unfortunately, it is a reality that some people have to face. If he is kicked off the team, there is obviously more going on that we know about. And again, this kid was seen as a leader and never got into trouble and then 6 months later he has allegedly gotten in trouble more than once and is kicked off.