Exactly what I was thinking.At Leicester he often plays as a false winger drifting from wide channels centrally, similar to how Foden or David Silva operate, in between the lines and between wide and central.
433 he either plays as the most advanced midfielder or as a false winger which is how he was used in Leicester. I would be tempted to say long term Kulusevski is the player most at risk from Maddison.
Flip side is we play Maddison RW and Kulusevski goes to his more natural LW.
But it almost makes sense to invert both of them if Postecoglou wants then to play in half spaces between the lines.