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.
Lawrence Timmons is not an IDP option for the faint of heart. On one hand, there's last year's top 10 finish, 106 tackles and six sacks. On the other, there's seven weeks where Timmons logged three or fewer solos in 2012. By the end of the 2013 season Timmons may well once again have worked his way into the top 10. Just don't expect him to be consistent while doing it.