Ok, so I can't even state my case?
2013 Seahawks: 14.4 ppg (1st), 273.6ypg (1st)
2013 Bears: 12.4 ppg (1st), 258.5ypg (1st)
2013 Seahawks: 63.4 opposing passer rating, in the pass happy fantasy football goodell era where the average qbr is 88!
The 85 Bears played in a time when the average offense scored 2-4ppg less and quarterbacks had qbrs 8-10 points less. The #1 offense in the NFL tore apart the 85 Bears in the regular season (the fish). The Seahawks destroyed the Broncos with the best superbowl performance of all time.
To say they "aren't even close" is just disingenuous. When you factor in the eras they played in, they are easily on par with each other.
Also, the 2008 Steelers? Please. The defense that let Kurt Warner throw 400 yards on them and Matt Cassel would of had a solid day if Moss didn't have stone hands in the regular season game.