Yeah, you can't win if you don't score.
Not sure what cap space the Oilers had/have but there were quite a few top ranked goalies available in the off-season (Markstrom, Ulmark, Stollarz) and probably a few more I'm forgetting. That's all on mgmt. All they have needed the past 5-6 years has been a goalie. They have/had 3 ex Leafs. I've never seen that before, Skinner, Campbell and Pickard. Campbell had "flashes" with the Leafs but for Oilers to give him that $$ was insane.
Not ragging on them, just what I see.
Leafs goaltending and defense has been very similar. I think they nailed it this year tho (so far)