On page 2 of the link....
FYI, here's a historical look at my own personal 5 and high 4 star rankings since 1997
5 stars
1997 Dominique Rhodes (Texas Tech)
1998 Ben Gay (Baylor)
2001 Cedric Benson (Texas)
2004 Adrian Peterson (Oklahoma)
2005 Jamaal Charles (Texas)
2009 Christine Michael (Texas A&M)
2011 Malcolm Brown (Texas)
2011 Brandon Williams (Oklahoma)
2012 Johnathan Gray (Texas)
* Five of the nine players (55.5%) were drafted by NFL teams: Cedric Benson (1st round), Adrian Peterson (1st round), Jamaal Charles (3rd round), Christine Michael (2nd round), and Brandon Williams (third round). None of the drafted players I ranked as five stars went lower than the third round when drafted.
* Three others (33.3%) went undrafted but played in the NFL: Ben Gay, Dominique Rhodes and Malcolm Brown, which means that nearly 90-percent of the players I've ever rated as five-stars at the position played in the NFL.
* Only one back was ranked as a five star and didn't play in the NFL... Johnathan Gray.
High 4 stars
1997 Hodges Mitchell (Texas)
1999 Ivan Williams (Texas)
2000 Tyson Thompson (TCU)
2003 Erik Hardeman (Texas)
2006 Vondrell McGee (Texas)
2006 Michael Goodson (Texas A&M)
2008 Cyrus Gray (Texas A&M)
2010 Lache Seastrunk (Oregon)
2012 Trey Williams (Texas A&M)
2015 Soso Jamabo (UCLA)
2015 Ronald Jones (USC)
2017 J.K. Dobbins (Ohio State
* Five of the 11 players (46%) were drafted by NFL teams:
Michael Goodson (4th round), Cyrus Gray (6th round), Lache Seastrunk (6th round), Ronald Jones (2nd round) and J.K. Dobbins (2nd round)
* One other (9.0%) went undrafted but played in the NFL: Tyson Thompson
* Of the other five backs that didn't have NFL careers...
* Mitchell was a two-year starter and a 1,000-yard back at Texas
* Williams was a sometimes starter, but mostly rotational back at Texas
* Hardeman was a major flame out.
* McGee was a bust
* Jamabo was a bust
My overall track record ranks a little better than Rivals.