Strength of schedule is calculated from the opponents projected fantasy points allowed for the DL 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.
It's happened without much fanfare, but Johnson has quietly become one of the NFL's better pass rushers. Johnson has now averaged nearly 11 sacks a season over the past three years. Last year the 26-year-old rode a career-high seven forced fumbles to a sixth-place fantasy finish at his position, and while you can't expect that production every season 40+ tackles and double-digit sacks are a very real possibility.