I've been thinking about this question a lot for some reason. I looked up a list of all time best RB's and I think I'd have to drop Lynch personally. I agree with Nine2Five. He's probably around the 15 mark or so after looking again. I was also thinking about AP, dude basically played 1 season less than Lynch and has 1500+ more yards or so than Lynch and if it was crunch time, I'd trust him to carry the ball just as much as I'd trust Lynch now that he's not a fumble machine like he used to be. But like 925 said, if Lynch wins another Super Bowl and notches a couple more good seasons, he's going to move up on the list.
I also didn't give Dorsett, Thomas, or Allen enough credit before. Looking at the stats, I was surprised to see that Curtis Martin had more yards than Tomlinson and he played one less season, but even then he doesn't seem to get a ton of credit for being an ATG. He was pretty damn good though. Same with Corey Dillon, even though he's not that high on the list as far as career stats. There were also a couple of dudes that could've been ATG if they would've kept playing, like Priest Holmes, Terrell Davis, and Eddie George.
Here's the list as far as total yards
1. Emmitt Smith+ 18,355 1990-2004 2TM
2. Walter Payton+ 16,726 1975-1987 chi
3. Barry Sanders+ 15,269 1989-1998 det
4. Curtis Martin+ 14,101 1995-2005 2TM
5. LaDainian Tomlinson 13,684 2001-2011 2TM
6. Jerome Bettis 13,662 1993-2005 2TM
7. Eric Dickerson+ 13,259 1983-1993 4TM
8. Tony Dorsett+ 12,739 1977-1988 2TM
9. Jim Brown+ 12,312 1957-1965 cle
10. Marshall Faulk+ 12,279 1994-2005 2TM
11. Edgerrin James 12,246 1999-2009 3TM
12. Marcus Allen+ 12,243 1982-1997 2TM
13. Franco Harris+ 12,120 1972-1984 2TM
14. Thurman Thomas+ 12,074 1988-2000 2TM
15. Fred Taylor 11,695 1998-2010 2TM
16. Steven Jackson (31) 11,388 2004-2014 2TM
17. John Riggins+ 11,352 1971-1985 2TM
18. Corey Dillon 11,241 1997-2006 2TM
19. O.J. Simpson+ 11,236 1969-1979 2TM
20. Frank Gore (31) 11,073 2005-2014 sfo
21. Warrick Dunn 10,967 1997-2008 2TM
22. Ricky Watters 10,643 1992-2001 3TM
23. Jamal Lewis 10,607 2000-2009 2TM
24. Thomas Jones 10,591 2000-2011 5TM
25. Tiki Barber 10,449 1997-2006 nyg
26. Eddie George 10,441 1996-2004 2TM
27. Ottis Anderson 10,273 1979-1992 2TM
28. Adrian Peterson (29) 10,190 2007-2014 min
29. Ricky Williams 10,009 1999-2011 3TM
30. Clinton Portis 9,923 2002-2010 2TM
31. Joe Perry+ 9,723 1948-1963 2TM
32. Shaun Alexander 9,453 2000-2008 2TM
33. Earl Campbell+ 9,407 1978-1985 2TM
34. Ahman Green 9,205 1998-2009 3TM
35. Marshawn Lynch (28) 8,695 2007-2014 2TM
36. Chris Johnson (29) 8,628 2008-2014 2TM
37. Terry Allen 8,614 1991-2001 5TM
38. Jim Taylor+ 8,597 1958-1967 2TM
39. Willis McGahee (33) 8,474 2004-2013 4TM
40. Earnest Byner 8,261 1984-1997 3TM
41. Herschel Walker 8,225 1986-1997 4TM
42. Roger Craig 8,189 1983-1993 3TM
43. Gerald Riggs 8,188 1982-1991 2TM
44. Priest Holmes 8,172 1997-2007 2TM
45. Maurice Jones-Drew (29) 8,167 2006-2014 2TM
46. Larry Csonka+ 8,081 1968-1979 2TM
47. Freeman McNeil 8,074 1981-1992 nyj
48. Stephen Davis 8,052 1996-2006 3TM
49. Garrison Hearst 7,966 1993-2004 4TM
50. James Brooks 7,962 1981-1992 4TM
51. Matt Forte (29) 7,704 2008-2014 chi
52. Chris Warren 7,696 1990-2000 3TM
53. Terrell Davis 7,607 1995-2001 den
I also didn't give Dorsett, Thomas, or Allen enough credit before. Looking at the stats, I was surprised to see that Curtis Martin had more yards than Tomlinson and he played one less season, but even then he doesn't seem to get a ton of credit for being an ATG. He was pretty damn good though. Same with Corey Dillon, even though he's not that high on the list as far as career stats. There were also a couple of dudes that could've been ATG if they would've kept playing, like Priest Holmes, Terrell Davis, and Eddie George.
Here's the list as far as total yards
1. Emmitt Smith+ 18,355 1990-2004 2TM
2. Walter Payton+ 16,726 1975-1987 chi
3. Barry Sanders+ 15,269 1989-1998 det
4. Curtis Martin+ 14,101 1995-2005 2TM
5. LaDainian Tomlinson 13,684 2001-2011 2TM
6. Jerome Bettis 13,662 1993-2005 2TM
7. Eric Dickerson+ 13,259 1983-1993 4TM
8. Tony Dorsett+ 12,739 1977-1988 2TM
9. Jim Brown+ 12,312 1957-1965 cle
10. Marshall Faulk+ 12,279 1994-2005 2TM
11. Edgerrin James 12,246 1999-2009 3TM
12. Marcus Allen+ 12,243 1982-1997 2TM
13. Franco Harris+ 12,120 1972-1984 2TM
14. Thurman Thomas+ 12,074 1988-2000 2TM
15. Fred Taylor 11,695 1998-2010 2TM
16. Steven Jackson (31) 11,388 2004-2014 2TM
17. John Riggins+ 11,352 1971-1985 2TM
18. Corey Dillon 11,241 1997-2006 2TM
19. O.J. Simpson+ 11,236 1969-1979 2TM
20. Frank Gore (31) 11,073 2005-2014 sfo
21. Warrick Dunn 10,967 1997-2008 2TM
22. Ricky Watters 10,643 1992-2001 3TM
23. Jamal Lewis 10,607 2000-2009 2TM
24. Thomas Jones 10,591 2000-2011 5TM
25. Tiki Barber 10,449 1997-2006 nyg
26. Eddie George 10,441 1996-2004 2TM
27. Ottis Anderson 10,273 1979-1992 2TM
28. Adrian Peterson (29) 10,190 2007-2014 min
29. Ricky Williams 10,009 1999-2011 3TM
30. Clinton Portis 9,923 2002-2010 2TM
31. Joe Perry+ 9,723 1948-1963 2TM
32. Shaun Alexander 9,453 2000-2008 2TM
33. Earl Campbell+ 9,407 1978-1985 2TM
34. Ahman Green 9,205 1998-2009 3TM
35. Marshawn Lynch (28) 8,695 2007-2014 2TM
36. Chris Johnson (29) 8,628 2008-2014 2TM
37. Terry Allen 8,614 1991-2001 5TM
38. Jim Taylor+ 8,597 1958-1967 2TM
39. Willis McGahee (33) 8,474 2004-2013 4TM
40. Earnest Byner 8,261 1984-1997 3TM
41. Herschel Walker 8,225 1986-1997 4TM
42. Roger Craig 8,189 1983-1993 3TM
43. Gerald Riggs 8,188 1982-1991 2TM
44. Priest Holmes 8,172 1997-2007 2TM
45. Maurice Jones-Drew (29) 8,167 2006-2014 2TM
46. Larry Csonka+ 8,081 1968-1979 2TM
47. Freeman McNeil 8,074 1981-1992 nyj
48. Stephen Davis 8,052 1996-2006 3TM
49. Garrison Hearst 7,966 1993-2004 4TM
50. James Brooks 7,962 1981-1992 4TM
51. Matt Forte (29) 7,704 2008-2014 chi
52. Chris Warren 7,696 1990-2000 3TM
53. Terrell Davis 7,607 1995-2001 den