Skowt and Rovals have only been rating recruits since the 02 class. None since then. I'm not sure there were any "star ratings" before skowt and rovals. There are many players that people assume would have been 5 star guys, like Marvin Harrison, or Konrad, but seeing as how there are only about 30-35 5 star guys per year, and there are about 8-10 schools out of 120 schools that land them all, I'm not sure we've ever gotten anyone that was the equivalent of a skowt/roval 5 star, when signed. We've had guys that performed like 5 stars once in college though. They tend to all go to football factories. We've never been a football factory.
There used to be magazines that named there "All Americans" like Parade. However, unless you know what their grading criteria consisted of, you can't compare it skowt or rovals. I don't think we can assume a parade all american was a 5 star recruit, simply because there were guys on Parade All American teams that didn't play at D1 schools. That leads me to think that the parade all americans were just the guys who put up the most eye popping numbers, regardless if they had offers from Ohio State, or Monmouth.
The only Parade/USA Today All Americans we have had were
Matt Neenan 1989
Scott Freeney 1991
Dulayne Morgan 1992
I've read from poster on here that Harrison, Konrad, and Mcnabb all were parade all americans, but a quick google search or the parade and usa today all american teams will show you they were not.