It’s also disingenuous to suggest that the Kings, Wings and Blackhawks had the same inevitable decline.
Detroit lost Lidstrom and Rafalski to retirement when they were still elite, Franzen to concussions when he was still elite, and Holland badly mismanaged their salary cap after that.
Chicago gave Seabrook the NHL’s worst deal, paid Toews and Kane more than Sid and Geno, and then traded Panarin and Hjalmarsson for no reason. Their window was still open and they shut it on themselves. Kane is still elite, Toews was good, they could have had Panarin. Stan Bowman ruined any hope that team had after 2017.
LA just put themselves in cap hell and their big money goalie declined a ton. They totally lost their identity when Sutter was canned as well.
Look at Boston. Bergeron and Marchand are similar in age to Malkin and Crosby. Their window, like Pittsburgh in 2015, looked closed and then blew open again.