Namath was the first QB to pass for 4000 yards in a season. ETA. It took Fouts two extra games to break the record.
In 1979, yes.
In 1980, Fouts passed Namath in only 14 games and then buried the record (which looks pale by comparison now). In 1981, he was just short of 4,000 after 14 games and then buried it again.
But then again - CAN we actually say the AFL's 1967 defenses were anything close to the senior league at that point? I think that's a fair question.
I'm not taking a position because I don't know. That the best teams in the AFL couldn't touch Lombardi's Packers is pretty well established, but that doesn't necessarily mean the rest of the league wasn't close to the AFL and vice versa.
But I can see it a lot of ways. Namath himself did lead in passing two other times - but note how far his numbers absolutely plummeted when the merger happened, and he had to face NFL/NFC teams for some of his games.
1967 - 4007 yards (led all of football)
1968 - 3147 (3rd in AFL)
1969 - 2734 (2nd in AFL); 3 NFL QBs had more yardage passing
1970 - missed 9 games with injuries
1971 - missed 7 games with injuries
1972 - 2816 (led entire league; Archie Manning 2nd with 2781 yards in 124 more attempts)
1973 - missed 8 game with injuries
1974 - 2616 yards (2nd in the league)
So how do we evaluate him FAIRLY?
It seems he was STILL a good QB (when healthy) AFTER the merger, but he also didn't run up anything close to his AFL numbers - which gives rise to the possibility AFL defenses weren't that good or certainly not what he was used to seeing.
In Super Bowl III, Namath was 17 of 29 for 206 yards and 0 TDs but - most important - 0 INTs. On the other hands, the Jets averaged 28.5 ppg in the regular season and then got 27 (pretty much their season average) in the AFL title game against the Raiders. Against the Colts, they got 16 points - 9 of them on field goals set up largely by the Colts turning the ball over 5 times.....which Namath had absolutely nothing to do with (just like he had nothing to do with the Colts missing two first-half field goals or the ball bouncing off a shoulder pad in the end zone that turned a TD into an INT or Earl Morrall not seeing Jimmy Orr wide open).
Of course, the flip side is that one can argue Namath's numbers also went down after repeated injuries, too. (This is why I'm so hesitant to jump on the "he was overrated" bandwagon).