If the polls were wrong in week 2, what guarantee is there that they're right in week 8. If the polls have any credibility, then of course the ranking at the time they played is what should matter. If ND goes in and beats the number 5 team in week 3, that's what they should get credit for. The victor shouldn't be penalized or held accountable for what happens to their opponent after they've been beaten. In other words SOS based on opinion polls is bs and shouldn't be a metric in the first place.