If these were already posted, my apologies.
Watching his play, his on ice spacial awareness is just not where it needs to be, even at the AHL level.
His shot and breakaway skills are world class for a player his age, but there is so much of his game that really needs work. He needs to stop coasting and puck chasing, and become more aware of everything happening around him (i.e. reading the play and work on his hockey sense).
In a perfect world, after the WJC the coaching staff watches the film with him and discusses in length what he has to work on, and he is open to improving those parts of his game with heavy minutes back in the OHL.
If he is not receptive to playing back in Junior, I am not sure you want to force him, and I have no clue what to do with him then.