The NFL's 17-game regular season schedule, combined with the league's high level of parity and injury risks, drives near-universal trader consensus against any team finishing undefeated. As of early November 2026, the Minnesota Vikings stand alone at 6-0 while teams like the Chiefs, 49ers, and Bills sit at 5-1 or 6-1, yet each faces demanding remaining matchups, travel demands, and potential roster attrition that have derailed similar runs historically. Only the 1972 Dolphins have achieved a perfect regular season in the Super Bowl era, underscoring the variance inherent in weekly outcomes. Realistic paths to alteration remain narrow, such as sustained health and favorable results for the Vikings or another contender through December, though late-season fatigue and opponent adjustments often intervene.