You seem to think that it's a talent problem, then it's a system problem. I think it's a system problem. Nurse and the like will look terrible defensively in a system that cheats defense in order to score offense. The only reason that Ekholm looks decent(sometimes) is because he cut his teeth in a defensively oriented team in NSH. I predict that soon he will start to be the new whipping boy, just like Larsson was, as he is left alone on an island time after time.
BTW, you completely misrepresented what I typed in my post above. I don't know how you can get "Nurse is defensively responsible", from mentioning Nurse as a player who MIGHT benefit from a better team defensive approach. I even stated that he was lost right now.
If the team leaders refuse to buy into a defensive approach, especially team leaders that have far more support from the fans and upper management that the coach does, then nothing will change.
Is the proper approach to have McDavid score more? RNH "only" had 104 points last year... not good enough? Same with Draisaitl's 128 points? Bouchard... not enough points? It's madness.