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While these seasons were all impressive in their own right, the play of these quarterbacks didn't quite dominate the league like the other ten performances that made the list.
Roger Staubach: 1971—While perhaps the best quarterback of the 1970s, Staubach put in several solid years of performance but never quite matched his Super Bowl-winning 1971 season, a season he wasn't even slated to start.
Captain Comeback's 1971 season doesn't qualify because he and Craig Morton would start different games, and even traded snaps in a disastrous Week 7 game against the Chicago Bears. Staubach wasn't installed as the starter until after that game, and won every game after that.
His extraordinarily low interception rate—1.9 percent of all passes thrown—would have been impressive in today's NFL, much less in the 1970s, where quarterbacks gave the ball away over 5 percent of the time.
Coupled with his prodigious running (343 yards, two touchdowns), a full season of these numbers would have catapulted him to nearly the top of the rankings.
Mark Rypien: 1991—One of two great seasons for the Redskins' Rypien, he led the league in 1991 in adjusted net yards per attempt, which gives penalties and bonuses for touchdowns and interceptions while also adjusting for the strength of opposing defenses. It is the statistic most highly correlated with predicting future wins.
Mostly on the strength of longer passes, Rypien's relatively average completion rate puts him on the wrong side of history for what makes quarterbacks effective. While a powerful force for one of the better teams to have won a Super Bowl, the Redskins defense contributed more to their run than many give them credit for.
Kurt Warner: 1999—Warner performed at a high level for many years, but turned in his top performance in his first full year for the Rams. Earning that year's MVP and winning the Super Bowl, Warner's Rams scored 30 or more points in 12 games that year.
Warner misses not because of any deficiency of his play that year, but because his dominance was not as established against the rest of the league in most statistical categories. The season is excellent, but not great.
Randall Cunningham: 1998—Perhaps one of the best offenses in history, the Vikings were a threat to score whenever they took the field. He converted eight percent of his throws into touchdowns, the second highest total of the decade, after Warner.
While some may have penalized him for having a good receiving corps, he is instead hurt for having a relatively average yardage total relative to the league (a result of the fact that he started 14 of 16 games), average completion rates and average interception rates.
Chris Chandler: 1998—The quarterback who led the Falcons team to their only Super Bowl turned 33 before putting in a good season's work. It was quite the season; he turned in the second highest unadjusted yards per attempt in post-merger history, and has the highest such rate relative to his peers.
Unfortunately, he just misses this list for three reasons: First, he posted an average interception rate. Second, he had the misfortune to play behind an offensive line that gave up 45 sacks and 283 yards, limiting his potential net yards when dropping back to pass. Finally, much of his yardage came against bad defenses. Chandler's season was very good, but not good enough.