Ameer is now 9/1 odds for winning the Heisman. Only behind Mariota (at 7/4) and Gurley (at 7/2). Comparing Mariota to Ameer may be a bit of apples to oranges given they play to distinct positions, but we can look at Ameer vs Gurley.
Ameer is the #1 rusher. Ameer has 114 rushes for 833 yds (7.3 ypa, 166.6 ypg) and 8 TDs. Ameer has 5 receptions for 108 yds (21.6 ypa) and 2 TDs. Ameer is responsible for 12 ppg. Ameer has the second most total offensive yards of any college player, if you exclude QBs who obviously have an advantage in generating offense (#110 overall if you include QBs).
Gurley is the #8 rusher. Gurley has 69 rushes for 610 yes (8.8 ypa, 152.5 ypg) and 6 TDs. Gurley has 9 receptions for 29 yds (3.2 ypa) and no scores. Gurley is responsible for 10.5 ppg. Gurley is not ranked in the Top 200 Total Offense category.
With the exception of rushing yards per attempt, Ameer has Gurley beat in all statistical facets. As far as the Eye-test, I got to give it to Ameer as a solid all-around back, without exceptions, while Gurley can do a lot but is still a power back with limits to his game.