I believe he's just defending the quarterbacks. Even if you're not the star per se, you're still top 30 at what you do in the world. They're all still verrrrry good; you don't get to the super bowl without a very good quarterback in the grand view of the game.
Sure, but I don't agree with his premise, that being a "game manager" is a slur; it's a type of QB who isn't a stat star, doesn't carry his team on his back, but doesn't turn it over a lot and can keep possession/keep drives moving. So, it's hard to view a guy like Trent Dilfer or Stan Humphries or Rex Grossman or Brad Johnson as much more than that. But Aikman's just wrong that game manager types don't get their teams to Super Bowls. Depending on whether you buy my definition, I bet you can reasonably argue that a third (or a quarter) of the Super Bowl starting QBs were "game managers." But if your defense is good enough, and/or you have a stud RB, that may be all you need. It's about winning; I'm sure Dilfer is just fine with that label as he twirls the ring on his finger.
Edit: I do agree that if he means that every NFL QB is pretty darn good, then he's right. That's not what I took from his comment, though.