As much as I wanted Todd Gurley last year, Gurley didn't have nearly the track record that Elliott had in College.
I say that for a couple reasons.
Gurley's best year was his rookie year and he got progressively worse production as his college career went on, even if he was becoming a better player at the time. He just couldn't stay healthy and we saw that again last year in his pro rookie year.
Gurley was a 3 years starter, where Elliott was a two year starter and Elliott still came away with more yards and touchdowns.
Zeke just strikes me as far more consistent a player.
I wouldn't be surprised if Zeke has 10 games for 100+ yards rushing next year, where Gurley had 5 his rookie year.