So then you are saying that private schools just have better coaches than public schools? Interesting....I think Coach Clapp at Page, Coach Felzien at White House, and Coach Roach/Coach Kirby at Heritage would disagree.
Coaching matters a whole lot! No doubt! However, quality talent usually wins out. Ridgeway was loaded with offensive firepower those years. Speed galore! You can coach first touch, movement off the ball, formational awareness, etc. You can not coach speed and athleticism. It is definitely a mix, and private schools are winning out on the talent, not the coaching.
IMO, the coaches mentioned above do as good of a job as anyone in the state with the talent they are provided.