Are you honestly trying to argue AM and MM have never cheated for offense in their careers?
Here's both of them at the same time on two OT losses a couple weeks apart last year.
Oilers game: Matthews is in position but just slowly glides back while Nurse goes by him to get in alone and score, Marner stops skating and puts no pressure on McDavid. I'm going out on a limb and saying they were saving energy for a 2 on 1 back the other way if the Oilers don't score.
Flames game: They are back and in position, all 3 Leafs are in front of all 3 Flames, both AM and MM skate forward instead of defending to cheat for a takeaway, one simple pass and it's a clean 2 on 1 against to end the game.