He is up their with the greatest coaches ever. But I don't like the different eras comparison. BB is coaching a different game from the one Landry, Noll, Gibbs, Walsh, and even Jimmy coached in.
While everybody loves to lay praise on BB for achieving all this in free agency era, I say free agency gave him the advantage. While it is working in some way in the NFC, it is totally dysfunctional in the AFC.
Free agency puts emphasis on management, coaching, and solid QB. When perfected you get the NE Patriots.
Dallas is average on all areas and that is why we are stuck. Same for the majority of team in the NFL, where they cannot get the balance right. NE amazingly (with some luck) have it set and maintained for a long time. Some teams get it right for a few years and they compete consistently for 2-4 years (see GB few years ago, Seatle recently). NE is maintaining this structure for a long time and they are blessed with a horrible conference and more horrible division to help them more. I say the closest during their era is Baltimore except they did/do not have a solid QB like NE. When Chargers beat Baltimore I said NE are the happiest side for this result. Baltimore are the only team who keeps beating NE in the playoffs when they get there. But they are missing consistent solid QB'ing.
NE have the BEST coach in football now and the best QB (in terms of dedication, hunger, commitment, and loyalty in addition to his skills that I rank top 10 all time). And their management is superior to all others.
I hate losing solid good coach more than a whole team. To me a great coach is worth a whole team.
Despite all the scandals, and questionable incidents, you have to give them credit for reaching this level of excellence