DD pretty much lost the game by losing the faceoff with 3 minutes left after Eller gained the offensive zone. Habs weren't able to regain zone entry for the rest of the game.
That concussion better be really bad, because Pacioretty is garbage.
I would say Gilbert's heroics are what lost the game.
Don't put it past this team to blow a 3-0 series lead. They have no offense.