You're assuming linear and internally consistent logic where neither exists.I get that, but if the classes are a fraud, then the grades are a fraud. It is connected. We cannot pretend otherwise. This is tantamount to discovering that the players never attended classes at all - that the school falsified records indicating that they were attending and passing classes. If the classes are a fraud, they never met NCAA requirements.
Highly selective prosecution rules with those guys. Sometimes that works in your favor, sometimes it doesn't. But if you try to apply critical thinking, you'll just end up pulling your hair out.