In the NFL, the prospect of any team completing a perfect 17-game regular season faces steep obstacles from the league's parity, lengthy schedule, and routine injury disruptions that sideline key contributors. Even top contenders typically encounter challenging divisional rivalries, short-rest situations, and road games against strong defenses that produce losses by midseason. Historical trends confirm that strong starts often fade as opponents adjust schemes and exploit depth issues, with no squad achieving an undefeated mark since the schedule expanded. The current trader consensus, reflected in the high implied probability against this outcome, aligns with these recurring patterns across recent campaigns.