The old NFL was the NFL. The AFL only existed from 1960-1969. To pretend an NFL title was the equivalent of an NFC title is, frankly, stupid. Most years, the only professional football was the NFL. There wasn't another conference or league with other teams and half the best players. If a team won the NFL title, it was called the NFL champion. Why? Because they were. Also, George Halas won 6 NFL championships after his all-pro career, and pretty much invented football and the NFL. As for coaching trees, these are part of the Halas tree:George AllenTed MarchibrodaDick VermeilMarv LevyShula had the undefeated season and won with the Colts and the Dolphins, but the most dominant championship game ever, 73-0 over the Redskins. Walsh modernized the game with the West Coast offense, but Halas modernized it first, with the T-formation, daily practice, film, coaches in the press box, radio broadcast, and sharing TV revenue. The Super Bowl trophy is named after Lombardi, but the NFL Hall of Fame is on George Halas Drive. As a head coach, Bill Belichick won 5 NFL championships, and might win a 6th. Halas won 6 as coach, but 8 as owner. Halas is also the #2 winningest coach in NFL history, behind only Don Shula. He's #3 in winning percentage, behind Shula and Belichick. I might not pick Halas to coach an NFL team today, but without him, I wouldn't have the option, because there wouldn't be an NFL.