Sounds like the Madison County DA got just one side of the story.
Is the injured boy conscious? Even so, with a traumatic head injury, he might not even recall the injury event.
If there’s a back story, such as friction between the injured boy and the football star, it might be difficult to get classmates to confirm.
I’ve read various things (fwiw) saying he can’t remember what happened. Also that the school/students may be protecting someone. As I said, just what I’ve read on social media.