Is The Oilers Level Of Play Sustainable?

The Edmonton Oilers are 6-1-1 and have the second best goals expected totals in the NHL. The Oilers are playing lower event hockey and keeping the goals against down, but their goals for is outstanding.

The top line has been dominant, but the real question is can the rest of the roster catch up? 32% outside of the top line is slightly concerning. 

The buy in from the team and the stars is at another level.

How long does it last?