Everything about Vegas is more about being lucky/flukey then it was bad management from other GM's.
-Reilly Smith was highly paid and struggling so getting rid of him at the expense of Marchessault isn't as bad as it is made out to be. No one thought Smith would play as well as he has.
-William Karlsson - no one expected him to do what he did, not a single person, just a great break for them. He will have a bigger target next season.
-Marc-Andre Fleury wasn't exactly playing great for Pittsburgh and they could only protect one goalie anyhow, they made the logical choice at the time.
-James Neal, as far as I know, was more of a cap move for Nashville, hard to blame them for that.
-David Perron was miles better than he has been, probably his whole career. Last year with the exact same ice time, he was 20 pts worse.
-Minnesota made a move to protect Dumba and their blueline, hard to blame them for that with defenders at a premium nowadays.
-Most of their team - is playing way above what they normally do, and will be hard-pressed to match it next season.
-They are reverse Red Wings, where on our team, pretty much everyone minus a few regressed or stayed the same, while pretty much everyone, far exceeded expectations or previous production.
All in all, I honestly think they captured one year lightning in a bottle, and I suspect next season, reality will hit and they will be just another struggling team. They are the kind of team, I could easily see in the Finals this year, and miss the playoffs all together next season.