Yesterday I saw people discussing which team had the best defense of all time. FO ranked every defense from 1950 in terms of DVOA and the 1991 Eagles came out far ahead. That was such a dominating defense, and people fail to remember that the offense that year went through a ton of QBs and could not stay on the field at all. They were constantly either going 3 and out or turning the ball over. If they had played with even a competent offense they would have been even better. http://www.footballoutsiders.com/dvoa-ratings/2014/historical-dvoa-estimates
85 Bears at 12? No.
I remember watching the 85 Bears games when I was a youngster with my dad and that defense was downright scary and just destroyed players.