Firstly, put Nance's 1966 at the top of the list. I'm not going to argue against it. Secondly, Dillon missed a full game in 2004 so the game totals were Dillon (15), Nance (14), and Martin (16) so your funny math is off. Thirdly, I gave you the yards per carry which is the more relevant stat than games played or total carries. Their Y/A are similar. Same with Y/G and TDs. Neither were a factor in the pass game. Both had better single seasons than Martin's 1995. Flip a coin between the two for who had the best.
It's almost comical when you look at Nance's season, compared with other RBs, he destroyed everyone.
1966 NFL RB Leaders
Attempts:
Nance 299
Clem Daniels 204
Mike Garrett 147
Yards:
Nance 1458
Clem Daniels 801
Mike Garrett 801
Y/G:
Nance 104.1
Clem Daniels 57.2
Mike Garrett 57.2
TDs:
Nance 11
Clem Daniels 7
Bert Coan 7
Don Trull 7