SOS doesn't take into consideration...
When you play them.
Where you play them.
Who's injured on their team.
Who's injured on your team.
Who they played the week previously.
Who they play the following week.
Are they coming off a bye?
Are they coming off a short week?
Have the so called strong teams played a bunch of weak opponents?
Have the so called weak team played a bunch of strong opponents?

SOS is so flawed it may be the most meaningless stat in NFL history.