Reggie Bush probably won't win the rushing title, but he should produce another extraordinary season. The West Coast scheme will allow Bush to further utilize his soft hands and unique versatility, which should translate to a stellar year.
But, if Daniel Thomas doesn't rebound from a disappointing rookie season, then Bush and the Dolphins offense will struggle as a whole.
Bush is a phenomenal player, but he really isn't an every-down back. He can't shoulder 20 carries a game, and he can't be relied on in short-yardage situations.
Thomas, on the other hand, has the anatomy of an effective short-yardage runner. Moreover, Thomas' deceptive speed and shiftiness makes him usable in virtually any scenario.
Injuries and poor offensive line play hindered Thomas last season, but it's pivotal that he gain confidence, improve his vision and succeed this season.