Great posting all around! Not trying to be an obnoxious Kings fan (a contradiction in terms?There are so many factors that play into NHL success in the playoffs. It's a game of momentum, both within a single game itself and on the season. It's all about getting hot at the right time, goaltending, and playing cohesively as a team. And then you need luck, officiating, health, and more to go your way as well. A couple superstars a cup winning team does not make.
It took the penguins 7 years (longer than McDavid has been in the league) to get their second cup of the Crosby/Malkin era even with perennial playoff experience and generally good goaltending.
Two years ago Tampa came in smoking hot as the heavy favorite and got swept in the first round.
Conversely in 2012 (I think?) the LA Kings fired their coach midseason, barely snuck into the playoffs as the lowest seed, and proceeded to dominate everybody losing only 4 games through the whole playoffs, going undefeated on the road, without home ice advantage in any series.
Things just have to come together in the right way at the right time. That is why many say it is the hardest trophy to win in all of organized professional sports. It takes a little bit of everything, right down to good old fashioned puck luck.