The difference is the competition. Sure Emmitt had a bad bowl , but you had 3 years of him running against SEC defenses. So, you could say with confidence that he just had a tough day. With Jeanty, you have seen him piling up yards in the Mountain West which is hardly known for defense. So, you have to scrutinize bad games against power conference teams a little more.
25 carries, 192 yards, 7.7 ypc 3 TDs against #1 seed Oregon
26 carries, 259 yards, 10 ypc, 4 TDs against WSU. Mountain west this year, PAC-12 last year
32 carries, 209 yards, 6.5 ypc, 1 TD against #20 UNLV
30 carries, 109 yds, 3.5 ypc against the #4 defense in the country behind a mountain west line
374 carries, 2,601yards, 7.0 ypc, 29 TDs on the year, second most ever in a season.
Don't get carried away trying to analyze a single game when there's a season worth of film showing the kid is a great running back.