I've never understood this line of thinking. Do you want a roster littered with 85 ovr freshmen? Absolutely not. But you mean to tell me Marcus Lattimore didn't have a season last year that necessitated an 85 rating? 19 TDs and 1300 yards? Or Adrian Peterson's freshmen year at OU?
They should be rare, but I have no problem at all with those "once-every-few-year" type talents being rated north of 80-81. I have Jadaveon Clowney at 84 ovr on my roster file with just a few other freshmen in the 80-82 range.