You hit the nail on the head. And for that reason, the system is flawed. Most programs have a two year cycle where the talent is high, followed by a two year cycle where the talent is low. The talented kids play down a class, the less talented kids play up. It makes no sense. Moving to a four year cycle would fix that problem. Eight points during that cycle bumps a program up.
Private schools moving up can be justified. They can recruit a kid from anywhere. By and large, I believe that 80% of a catholic school's success comes from within. Let's face it, those catholic kids can play some football. Recruiting is just 20%. Enough for the bump up, in my opinion.