There's no chance he plays on Dixon unless it's a rotation thing for a few minutes or something. Butts/Borlase, Keane and Worrell will all be more likely to get a strict defensive role.
He'll be half-back and I'm sure he'll get some sort of defensive duty but it won't be permanently marking a key forward.
I would of thought
Butts on Dixon
Keane on Marshall
Worrell on Finlayson (assuming he comes in)
Curtain on Georgiadis
Borlase dropped?