The average five-star draftee's position in 2015: 77.79.
The average among all four-stars and three-stars: 123.09.
Two-stars and unrated players? 164.3.
That's a 2015 difference of 87 picks, almost three full rounds, between the average five-star pick and two-star pick. That's similar to the difference between being a Thursday name and a Saturday name, between, say, $4.5 million in guaranteed money for the No. 32 pick and $962,000 for No. 119
It's telling that from a recruiting class-like thing including thousands of players, 24 draftees were five-star recruits. From a fluctuating pool of only about 30 or 40 five-stars, 24 became draft picks. Eight of those 24 were first-rounders.
http://www.sbnation.com/college-football-recruiting/2015/5/5/8547409/nfl-draft-recruiting-rating-ranking