A better question is can the greatest defenses of past eras play in today's NFL? No
The defense had advantages also - headslaps, mugging the receivers, later hits to the qb. Manning wouldn't feel so comfortable with shots to the head that weren't flagged. Could 240 pound DL's compete today? No. The Fridge was a freak in 1985, now he would be the smallest lineman.Imagine what Peyton Manning could do to a 1970's defense....He changed the play? What? 7 defenders look up. Ball is snapped. 3 receivers arent covered while everyone looks to stick Trent Richardson.
Hard to compare. The game is so different from 85'. The athletes and players are soooo much better now. The 85' bears would have been flagged every other play if they played by todays rules.
But the players today are nowhere near as tough as the older guys. Probably a wash. 85 bears were that dominate and feared. This year's Seattle team isn't feared on D from a physical standpoint. They are just athletic. The Balty D of 2000 was feared from a physical standpoint.
Seattle probably has the best secondary of all time.
Kam Chancellor, Averill and Bennett are very physical players as is E. Thomas for his size. People forget Bobby Wagner is also an all pro that will hit you in the mouth. Nobody wants to go over the middle on Chancellor.
Imagine what Peyton Manning could do to a 1970's defense....He changed the play? What? 7 defenders look up. Ball is snapped. 3 receivers arent covered while everyone looks to stick Trent Richardson.
A pretty strong arguement can be made for the Seahawks. The 85 Bears held teams to an avg of 11.4 vs 14.2 for the 13 seahawks. 1985 the league averaged 15 ppg vs 27 ppg in 2013.