When your argument is that Ron Dayne was "better" than Mike Rozier because he has more yards and more touchdowns, yards per carry and number of years played is a HUGE factor in that discussion. HUGE.
Let's look at a few things here. As mentioned above, Rozier has more YPC than Dayne and played three years to Dayne's four. TDs per year are nearly even, with Dayne having an edge, 17.75 per year to Rozier's 17 per year. Close though.
But a more telling stat is this - what percentage of his team's offense was the guy?
Dayne benefited greatly from being the only show in town. During his four seasons at Wiscy he accounted for 45% or greater of their rushing yards three times, not only because he was good (he was) but mostly because they didn't have anything around him. He was the only running back of any caliber they had, and they used him a lot.
In 1996, Dayne's freshman year, he accounted for 55% of their total rushing attempts and 45% of their total rushing/receiving yards from scrimmage. If they'd have had anyone else to use they'd have used them. But they didn't. Here's Dayne's percentage of rushing attempts & yards throughout his career:
Year - Rushing Attempts - Percentage of Total Team Rushing Attempts - All Yards From Scrimmage (Rushing & Receiving) - Percentage of Team's Yards From Scrimmage
Year - ATT - % - ALL YARDS - %
1996 - 325 - 55% - 2,242 - 45%
1997 - 263 - 43% - 1,574 - 35%
1998 - 295 - 49% - 1,570 - 40%
1999 - 337 - 53% - 2,043 - 41%
Now, let's contrast that with Rozier's three years at Nebraska:
Year - ATT - % - ALL YARDS - %
1981 - 151 - 23% - 1,007 - 21%
1982 - 242 - 32% - 1,735 - 28%
1983 - 275 - 38% - 2,254 - 34%
So, what does this tell us? It tells us that Dayne was, by far, the only weapon Wisconsin had. He never accounted for less than 43% of his team's total rushing attempts, while Rozier never accounted for more than 38%. Why? Because Rozier was part of the Scoring Explosion Era at Nebraska, and Rozier had to share carries with other fantastic players.
In Rozier's Sophomore season he wasn't even the top rusher - that honor was held by Roger Craig, who I'd venture to say was also a better running back than Ron Dayne, hardware or no.
Contrast Rozier's Heisman year to Dayne's for an even greater disparity. Dayne had 15% more of his team's total carries than Rozier the year each won their Heismans, yet Rozier gained 211 more total yards and scored nine more TDs.
Go year-by-year and look at their attempts and their results, and each year Rozier eclipses Dayne.
Sophomores: Rozier averaged 6.2 yards per carry to Dayne's 5.5, and Rozier was playing behind Roger Craig.
Juniors: Dayne averaged 5.2 YPC to Rozier's 7.0, and Rozier still had to share carries with Craig parts of the year.
Seniors (Heisman): Rozier averages 7.8 yards every time he rushes the ball, while Dayne gets 6.0. Dayne scores 20 TDs, 44% of his team's total scoring that year, while Rozier easily beats him with 29 - yet that was only 35% of his team's scoring.
Even having to share the ball with some of college football's all-time-greats, Rozier's stats are clearly superior to Dayne's, and it's not even close. Dayne played with nobody special. Rozier played in the same backfield as Roger Craig for 2/3 of his career and with fellow Heisman Trophy finalist Turner Gill his Senior season.
And bear in mind through all of this - these are just statistics. They mean nothing compared to actually watching either guy run the ball. Go look at each guy's career highlights at their respective colleges. Post that here, if you want. It'll only prove my point even further.
If someone wants to claim Ron Dayne is better than Mike Rozier... OK. Just don't expect to be taken seriously.