As per my list on the B10 forum, minus the riff-raff...
1. Herschel Walker, Georgia
2. George Rogers, South Carolina
3. Nick Chubb, Georiga
4. Darren McFadden, Arkansas
5. Kevin Faulk, LSU
6. Bo Jackson, Auburn
7. Errict Rhett, Florida
8. Ralph Webb, Vanderbilt
9. Dalton Hilliard, LSU
10. Charles Alexander, LSU
11. Emmitt Smith, Florida
12. Anthony Dixon, Miss State
13. Leonard Fournette, LSU
14. Benny Snell, Kentucky
15. BenJarvis Green-Ellis, Ole Miss
.
This isn't about a guy's 40 time or Heisman chances or draft stock, it's about how productive he was in college. Yes, leaving early hinders you on this list. 4 years of productivity > 3 years of productivity