Vegas rolls their lines and pairings. Vegas played well within a system.
Yes, they have good personnel on defense no doubt but Vegas just plays more of a team oriented, fundamental game.
Adin Hill was a cast-off prior to last season. The system is a big part of their success.
As far as the Oilers getting the most out of their players. It's the same old thing over and over again. They have new guys/prospects that bubble up and play well for a while then as time goes by, the production disappears.
Guys like Hyman, Kane and RNH are always going to produce because of McDrai but I'm going to beyond that to the role players. McLeod can't piss a drop of offense anymore, same with Holloway, 4th line non-existent again this year, Ceci great the first year and hasn't fallen off a cliff since, Ekholm struggling this season although that could be due to lingering injury, Bouchard struggling, shine came off of Desharnais after a strong start, same with Skinner etc. etc.
There's a ton of other examples of this from previous years when guys fell off after a strong start. Something about this place eventually gets to players where their play eventually falls off the longer they're here.
Vegas, on the other hand, consistently gets the most out of their players. Hell, most of their players right off the bat with their initial year was a bunch of cast-offs who had new life in Vegas and it's still happening with them. Also happened with Seattle funny enough including our former Adam Larsson.
Yes you need the talent but a good environment/system is also important.