I'm fully aware of those schools and if you're going to correct me you should probably know that it's Glenville in Cleveland, not Grenville. I'd be happy, though, to amend "always" to "almost always." Unlike a lot of states, the Catholic and Public schools compete against each other in the state championships and in the largest division in the state I think the Catholic schools have won far more championships than the public schools.
I'd venture to say that both Michigan State and Michigan still have a quarter of their rosters coming from Ohio.