It still took Carolina 7 games to beat them. I'm not sure why you keep downplaying how good Buffalo was in 2005-2006.
There is a gap between good and particularly good, they faced good teams, Devils were a good team, the 2006 and the 2007 Sabres could have been particularly good when healthy, but they were not, making them just a regular good playoff teams. (and we can enter circular reasoning here a bit, Canes were great they did beat the Sabres, why the Sabres were good?, it took 7 games for Carolina to win the series)
This is not the general feeling that a Colorado would re-win it with that core many times after they beat the particularly good Red Wings in 1996.
Since 1970, the back to back champ
- 1975 Parent/Clarke/Barber/Leach flyers
- 77-78-79 4 cups in a row maybe best team of all time Habs Dynasties
- 81-82-83 Dynasties Islanders
- 1985 Gretzky Oilers
- 1988 Gretzky Oilers
- 1992 Mario pens
- 1998 Red Wings
- 2017 Crosby-Malkin Pens
- 2021 Kucherov-Point-Hedman-Vasileskiy Tampa Bays
If you are not the 2002 Red Wings, you pretty much always easily take the league against any single team even the previous cup winner.
If we make the question more precise: did you think the Canes had more than 25% chance to be in that rare group because they were both a way better than average Stanley cups winners and particularly well-placed age/keeping free agents wise to be next summer in talk to be put in next hockey Dynasties list that will try to go for 3 in a row, saying no to that should not be seen as putting a champ down.
With Whitney-Weight-Reechi and a Cam Ward playing like he was playing they were loaded enough to get around not having a big name number 1 D on a legit cup winner, which is already a lot.
The second half 90s Red Wings, 80s Oilers or 10s BlackHawks, 20s Tampa they were not.
How much would you have bet that summer that a team defense group led by Bret Hedican and a rookie goaltender will repeat ?
It is just really hard to be in that this team will go repeat it category.
The panthers were a great champ, kept their core, this summer they were a +900 betting line to repeat, i.e. a ~10% chance of winning..... it is really hard to win 4 round of hockey, it is extremely hard and rare to do it 2 years in a row.
The Ducks did not felt like a team that would likely repeat either... but an argument could be made they had a higher chance to do it. The Red Wings were the kind of team that felt likely to repeat in comparison.