Vegas didn't even fully take advantage, in terms of the roster built for last season, of better expansion draft rules because they made deals and picked players further down teams lists than they could have if they picked for the "best" players they could based on reputation at the time. They were handed what was thought a bottom five team and turned it into one of the best.
The stats were not out of whack, Vegas was that good last season. The only outlier was Karlsson's shooting % but everyone knew that.
Everyone didn't have a career year. Wild Bill's goals (not his assist total) and Perron's point total were probably the only that qualify there.
Haula had 29 goals but deserved every one of them, no statistical anomaly, and simply had a break out year. He is capable of putting up similar numbers. It really is too bad for him he got injured.
It was a genuinely great team of players given more opportunity that played well in a unique season, in many respects.