The Math is flawed. First you can not remove lower rated players such as football championship level players then say how accurate the recruiting services are, nor can you use the numbers from anygiven year the number of five stars. This years draft had recruits from maybe three or four recruiting classes.
A more accurate evaluation would be to take the recruits from say 2003 and and evaluate who from that recruiting year was drafted and what their star rating was at that time. This article seemed lazy and not very well thought out.