Strength of schedule is calculated from the opponents projected fantasy points allowed for the LB 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.
After a completely torn hamstring cost Bishop the entire 2012 season, the Green Bay Packers parted ways with Bishop in June. He wasn't out of work a week before landing a deal with the division rival Vikings. If Bishop's healthy and wins the starting job at MLB for the Vikings there's LB2+ upside to be had. However, Bishop also carries a fair amount of risk in IDP drafts this summer, as the track record of players returning from this type of injury isn't good.