I've heard LA rebuild wrong for years and then 2 cups came along. Islanders also. All it takes is one good off-season.
It definitely just doesn't come by getting a butt-load of top 5 picks. It comes from a competent GM who is willing to make a big trade or signing when the time is right.
Drafting down the middle and on the backend is a big, big deal too. Additionally, ensuring that picks that aren't 1st rounders are developed properly. None of the two 2010's dynasty teams (Chicago & LA) win the cups without these big processes.
Buffalo might very well end up like the Oilers; I don't think anyone can tell yet. There's still a few painful years in front of the Buffalo faithful, unfortunately.
Did they draft differently? Oh yes, smart two-way skilled centers and big dmen versus small skilled forwards.
Are they both rushing players up? There's some parallels here, I'm happy they sent Reino down; but they are giving big minutes to RR and Zadorov... who while absolutely capable, look like 20 year olds out there A LOT. Both could have used more seasoning and time away from one of the worst teams, ever.
Are they surrounding players better? The Sabres at least brought in pieces this year to take a lot of the damage away from the kids. JG and Gionta are definitely guys who can take some abuse (and oh are they taking it this season), Edmonton was generally unwilling to spend money on any kind of actual NHLer.
Who knows at the end of the day. Having one of Eichel or McDavid would definitely help move this team forward; but it's certainly not the be-all-end-all of the rebuild.