Montgomery is a solid back but Sargent had a higher YPC against tougher defenses. As good as ISU fans think Montgomery is, his stats are pretty underwhelming.
Real late, but Sargent had only two games where he rushed for over 100 yards, six games where he rushed for less than 50 yards and and four games where he had between 50-91 yards. His 100 yard games were against the stout defenses of Nebraska and Illinois
Montgomery missed a game and had 6 games where he rushed for over 100, two games where he rushed for less than 50 and the other three he had between 33-53 yards