Strength of schedule is calculated from the opponents projected fantasy points allowed for the RB position. The best rating is +16 which gives the player the advantage against the defense and indicates an easy opponent, the worst rating is -16 which gives the defense the advantage and indicates a tough opponent.
Rhodes the self proclaimed starting RB, was brought in to add more depth at RB position, he should see significant action the first 3 games of the season while Lynch sits. Watch how this situation plays in training camp and the beginning of the season.