And so did Cadillac throughout his whole Auburn career and has continued on into his NFL career, and nobody seems to be concerned about it or care very much. 
NFL Yards
Caddy - 2,000
AP - 0
NFL OROY
Caddy - 1
AP - 0
NFL ROY
Caddy 1
AP - 0
One word to define your line of thinking:
Fairweather.
Caddy put up 1,000+ yards sharing the ball with two fellow NFL backs (Ronnie Brown, Brandon Jacobs, and Kenny Irons) against the SEC, AP did it alone against the Big 12 which has more porous defenses than a casting net.