I love the "well we lost that game that one time" argument. Stop making it seem like this is a recent anomaly, yes, public schools have won the majority of the titles, as they should; they make up 85% of the IHSA member schools. Since the beginning, in 1974 there have been 348 state champions crowned across all classes in football and private schools account for 126 titles. So only 15% of the schools are responsible for 36% of the championships. Doesn't matter what decade, it's not new.
I believe you were the one who brought up the Phil Jackson example, so what's your answer? Is it the coach or the players? Evanston and Minooka are 8A schools, so there's plenty of kids in the building, who are regular playoff teams, so hardly rags to riches. 5 rings and 3 undefeated seasons is absolutely incredible, but the question will always linger as to whether he could do it without an all star team. I love how the other coaches you mention also only coached in the CCL. What about coaches like Mike Noll or Larry McKeon who had success at multiple schools with just kids from the district or coaches like Reents who makes his system work with whoever gets off the bus and not brining in kids that fit his system.
Find me a coach listed in the link that had success in the CCL and at a public school.
The official site for the Illinois High School Association, providing schedules, scores, and news for high school sports in Illinois.
www.ihsa.org