I'm surprised we have turned to Schache once again. His VFL form has been OK but nothing that shows genuine improvement in key areas: physicality, as you highlight and the ability to take an overhead contested mark. I think we should regard this as his last chance and without reasonable improvement I can't see any contract extension forthcoming.
Guessing he'll share ruck duties with Martin. He could also go forward or back. Crows have some tall backmen and he could tie up one of them if Bont plays more mid.