Strength of Schedule is calculated from the opponents projected fantasy points allowed for the RB position. The easiest rating is 1 which gives the player the advantage against the defense and indicates an easy opponent, the most difficult rating is 10 which gives the defense the advantage and indicates a tough opponent.
James is a big name but he hasn't done much so far in the NFL. In four seasons James has carried the ball just 44 times for 193 yards. The Dolphins don't have a lot of depth at running back, so James could earn a role as a reserve/return man.