1940's or 2020 kids don't see things clearly until the situation confronts them head on and even then they just accept it as the norm.
Alvin Dark wrote his autobiography not knowing how he was discovered.
Coaches develop recruiting relationships with other (HS) coaches, they don't develop relationships with non performing high school athletes.
When you have a late bloomer you don't want your newly directed attention to be spent creating awareness. If you can help it.
Being highly ranked in a MM poll helps with pre engagement awareness.