Strength of schedule is calculated from the opponents projected fantasy points allowed for the DEF 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.
The 'Pack couldn't catch a break at ILB last year managing to lose not 1, not 2 but 3 players to season ending injuries. That's even before discussing the injuries in the secondary! Yes, they've lost Charles Woodson, but given the ample talent they have in the secondary they won't miss a beat. Hard to argue it wasn't time to move on, much like another safety. As soon as this team has a legitimate book end opposite play maker Clay Mathews you can classify this one under the heading “Scary good”.