In every sport there is a time where the heart rises to the top - typically when everything is on the line... soccer, golf, etc..
Guys like MM have difficulties playing in the playoffs bc every play must be earned. Every player gives that extra which speeds the game up, quickens the decision making, shortens the gaps. This forces MM and the like to have to work harder to match (they never learned, glided along on skill alone) but he doesn't have it in him - his whole game is predicated on fanciness which is great for 82 games of slightly less intense hockey , but when the heart players kick into overdrive that extra gear doesn't exist.
Bear in mind.. trickster softies is effective when you catch a different team every other night, but when you face a 7 game series the other team sees everything in game 1.