Strength of schedule is calculated from the opponents projected fantasy points allowed for the WR 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.
Insurance for if the younger more talented players don't pan out, could play the Nate Washington role but the Steelers would prefer one of the young guys step up and take it.