Nurse and Klefbom virtually played nothing before getting McDavid, he played one 60 game stretch where he scored 2 whopping goals, 20 points and was a -21. Which is normal as he was basically a rookie. Nurse played nothing before Chiarelli got here.
The Oilers were never that talented before. It was basically the equivalent of this ...
Oilers were hyped to be super talented because three no.1 overalls should yield at least 2, more like (well) 3 top end players like Stamkos or Tavares or (gulp) Crosby, but the fact is the Oilers only got one high end player to show for that (Hall) and that player was not a Crosby/Ovechkin tier player either.
RNH still after 7 years has never once scored at a 70+ point pace, Ales Hemsky (13th overall pick) did that like 3-4 times already in his first 7 years here.
Yakupov is a straight up bust. People say "wow, three no.1 overall picks" and figured that meant Stamkos + Tavares + Patrick Kane. Instead it was really more like Phil Kessell (Hall) + Brayden Schenn (RNH) + Patrik Stefan (Nail Yakupov).
Now for Chia, the hockey gods made that up by gifting the Oilers Draisaitl and McDavid, that effectively could've created a "big 3" dynamic where Hall is the third best player and let RNH be a support player. So eventually we did have that made up for us, but anyone saying the 2010-2015 era Oilers were "super talented" is a liar, super hyped sure, but the reality on the ice was not that talented.