How the seasons were chosen
Championship achievement, regular-season winning percentage, scoring margin, offensive and defensive balance, and historical significance all matter. A championship receives substantial weight, but an exceptional finalist or regular-season team can be selected over a less dominant champion. No universal ranking or exact strength-of-schedule adjustment is claimed.
Each card names meaningful alternatives where the decision is close. This is a cross-era exhibition, using the current conference and division structure for a fictional league. Historical cities and team names are retained in the season descriptions. The Houston Oilers’ history follows the Titans; the Browns retain Cleveland’s pre-1996 history; the Ravens begin in 1996.
Membership reference: official NFL team directory. Seattle’s 2025 championship was considered before retaining the 2013 team.
How historical performance becomes game ratings
We compare points per game with the league scoring environment of the same season. Before the merger, the comparison uses the team’s own league: the NFL for Green Bay and Cleveland, and the AFL for the 1968 Jets. This avoids giving a modern high-scoring season an automatic advantage over an older champion.
Offensive base = 75 + 44 × (team points per game ÷ league points per team per game − 1)
Defensive base = 75 + 65 × (1 − team points allowed per game ÷ league points per team per game)Passing and rushing ratings start from the offensive base and receive editorial adjustments for the team’s style. Rushing efficiency, sacks, opponent rushing efficiency, field-goal percentage, punting and return performance help distinguish units. Historically defining units receive explicit editorial adjustments: for example, Baltimore’s run defense, Chicago’s pass rush, Seattle’s coverage, and Indianapolis’s vulnerable 2006 run defense. Ratings are rounded and limited to 45–99.
Quarterback accuracy, arm strength, decision-making and mobility; running-back speed, power, receiving and security; and receiver separation, hands and deep ability are game estimates, not measured historical athletic tests. Ball security uses lost fumbles relative to rushing workload; named substitutes receive lower estimated ratings. These estimates do not establish that players from different eras had equal physical ability. Championship results never force a win.
Source notes: season totals were retained when a source’s quarter breakdown disagreed with verified totals (2024 Philadelphia, 2015 Arizona, 2013 Seattle). Minnesota’s 1998 punting average was recomputed from individual punters because its source aggregate contained a transcription error. PF and PA below are regular-season totals; playoff results appear separately.