To be honest, the basis for 'All American' is not straightforward. It could draw elements from multiple real-life stories and characters, but no single identifiable source.
I'm not sure exactly who it's based on. Maybe it's inspired by a combination of real-life people and events.
I don't have a definite answer for who the true story 'All American' is based on. It seems to be a fictionalized blend of various influences and inspirations from real life.