Perhaps the BEST B1G Forum anywhere, here at College Football Fan Site, CFB51!!!

Playing conditions, however they play.  I doubt OLs change all that much, knee braces aside.  Mebbe.  

then you have to define full pads

do olinemen wear knee braces?

OL shouldn't run the 40 to begin with.  Totally useless information.

OL shouldn't run the 40 to begin with.  Totally useless information.

Agreed. 10 yd split is only useful thing for oline from the 40. 

I agree, but 40 time is an indicator of athleticism

Yes, and they do other measurements as well that are not as often cited, like vertical jump.

My GUESS is the pros don't care much about the 40 times unless someone turns in something very unexpected, or there is concern about some player's speed and he does just fine (Nick Chubb for example).

Next 10:
Jim Brown
Marshall Faulk
Edgerrin James
Marcus Allen
Franco Harris
Thurman Thomas
Fred Taylor
Steven Jackson
John Riggins
Corey Dillon
.
Hell, even fewer here were fast.  James was fast until he hurt his knee 3 years in.  40 times are a tradition, nothing more. if it was important, the Raiders would be the Patriots.

I have only gotten to page 4, so I'm posting this without the knowledge of how you have used ypc and receiving yardage to adjust the original list.

But at least in the case of OU's running backs, I think your original list is off.

Here are OU's career leaders in rushing yardage.

Player   Posn   Yrs   Yds   Carries   TDs   Ypc   100yds   200yds

1.	Samaje Perine	RB	2014-16	4,122	685	49	6.02	15	6
2.	Billy Sims	RB	1975-79	4,118	593	53	6.94	20	7
3.	Joe Washington	RB	1972-75	4,071	675	39	6.03	19	1
4.	Adrian Peterson	RB	2004-06	4,045	747	41	5.41	22	6
5.	Steve Owens	RB	1967-69	4,041	958	57	4.22	23	3
6.	Quentin Griffin	RB	1999-02	3,938	744	44	5.29	16	4
7.	DeMarco Murray	RB	2006-10	3,685	759	50	4.86	13	1

But you've got them in this order on your initial list.
66. Perine
77. Peterson
84. Washington
93. Owens
112. Sims
116. Griffin
Other notables. Murray

Sims, Washington, Peterson, and Owens are all out of order if you are talking in terms of career rushing yardage, which you posted that you were at that point.

Hmmm.

Perine played in bowl games all three years he played, 2014-16.
Peterson played in bowl games all three years he played, 2004-06.  I think.
Washington only played in a bowl game his freshman year, 1972.  EDIT: Correction, he also played in the Orange Bowl vs. Michigan after his senior year.
Owens only played in bowl games his sophomore and junior years, 1967-68.
Sims probably played in four bowl games, 1975, '77-79.
Griffin played in three bowl games, 2000-02.
Murray played in four bowl games, 2006-10.

I think that wishbone halfbacks get undervalued in your ranking system because they tended to get fewer carries than the tailback in an I-formation offense or the running back in a pro-style 2-back offense.  I'm just noting that.  There's nothing you can or should do to "fix" that.

I agree with you on the NCAA and bowl stats.  If they are going to count them, and I think they should, they should retroactively count bowl-game yardage of the modern era.  It might not be possible to get individual stats of the 1946 (season) Harbor Bowl, but Barry Sanders' stats from the 1988 Holiday Bowl are easily retrievable.