To rank these teams, I used my proprietary DVOA ratings ( explained further here) which look at efficiency on a play-by-play basis adjusted for situation and opponent. For teams prior to the start of DVOA in 1981, I estimated DVOA ratings based on Pro Football Reference's Simple Rating System plus the average margin of victory during the postseason. There's also an adjustment for the first four Super Bowl champions to reflect that the NFL was stronger than the AFL before the merger.
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