walker has been "sheltered" out on the wing so he can utilise his pace and skills. it has been working well for them with him being able to take the ruck work on that side of the ground and free up there starting ruckmen a bit
Probably not the ideal development process for John though in promoting him as a prospective AFL key position player.
Admittedly, it's a good team tactic if you're trying to make the team play better.