I agree that I have never really heard of a "5-star level" recruit not being able to be admitted either in football or basketball due to academics. Sure, you here all the time about mid-tier recruits, but guys like Ford I think get admitted one way or the other.
Same thing happened with Larry Fitzgerald and Shady.
For PSU lurkers, has there ever been a blue chip recruit with a signed LOI who was denied admission? My guess is that PSU has systems in place to get them admitted. I cant admissions the admissions counselor calling Pedterno and saying, "Hey, Joe, we cant get Recruit X admitted because he got D's in European History and Geometry." Pedterno would just say, "Yea right, call me back when they are C's."