I can see the logic but despite their loss this weekend, Freo are much better side than the bombers. Their midfield (Serong, Brayshaw, Young) is up there with the best in the league when they are firing. The Darcy/Jackson ruck duo is a real threat and I think we lose if they are left to dominate.
I agree that Fullarton is not a genuine ruck and JVR would probably win more hitouts, but I think we'll need him forward in this game. I feel more comfortable with trialling Fullarton than having Petty ruck most the game. Max will hopefully be back next week so it gives him one good opportunity to show something on the big stage.