The NFL's combination of league-wide parity, an unforgiving 17-game schedule, and routine injury attrition drives the overwhelming trader consensus against any team finishing 17-0. Only the 1972 Dolphins completed a perfect regular season under the prior 14-game format, while the 2007 Patriots' 16-0 mark remains the closest modern benchmark; no club has posted even 16-1 since the schedule expanded in 2021. Contenders such as the Rams, Bills, Ravens, and Seahawks enter 2026 with strong rosters and favorable early matchups, yet each faces multiple road tests, divisional rivals, and the statistical likelihood of at least one loss from variance or rest disadvantages. Scenarios that could still shift odds include a historically dominant team avoiding key injuries through December or an unprecedented run of favorable officiating and weather, though historical patterns and roster depth across the league make such outcomes remote.