The NFL's intense parity, grueling 17-game schedule, and elevated injury risk make a perfect regular season exceptionally rare, with only the 1972 Dolphins achieving the feat in the Super Bowl era. As of mid-October 2026, the San Francisco 49ers and Minnesota Vikings stand at 5-0 while the Kansas City Chiefs sit at 4-0, yet each faces mounting challenges including tougher remaining opponents, potential roster attrition, and the variance inherent in weekly matchups. Trader consensus reflected in the 93% price on "No" aligns with these structural barriers, as even elite teams like the 49ers and Chiefs have historically seen form dip over a full campaign despite strong early results.