Bill is doing what he is doing in an era where NFL policies and rules attempt to force parity and essentially punishes success......where free agency & salary caps and huge paydays makes dynastic runs all the more improbable......the size and scope of the NFL these days doesn't compare to the NBA of the Auerbach era
Red was a pioneer of the sport, a tremendous coach, and a hell of a guy........but he did it in an era where it was in essence easier to sustain......player movement was minimal, his team was one of the haves of the league, if not THE have......he held all the control and the set up was such that continued success was, well, easier......yes he still got the job done and is one of the all time greats, but.....
Bill is, IMHO, the greatest coach of all time.....I know it is hard to compare across sports and eras, but the only two that come close for me are Wooden & Lombardi just for how they were able to get buy in and get the absolute best out of their players and at the right time........but BB does that and more, along with all the trappings of the modern sports scene......his attention to detail is amazing, and his building of a winning culture in a sport that truly demands such a culture (so many more moving parts than a 5-man team with a 15 man roster) is simply remarkable....