I see it different. He used all his edges just carrying the puck up ice, rather than skate fast.
I saw him play almost every shift between the face off circles, never lower in either end and never closer to the boards.
He is super skilled puck handler, great skater, has in his junior career been a playoff leader but that part of his game has not translated. He appears not to be able or willing to extend himself to playoff level in the NHL.
I have used the word coward, rather poorly, because he is not a coward, but certainly has not performed. AM has figured it out. You can see it.