If Duman and Logue are in doesn't it release Conca/Cerra to the bench? The midfield is already full, and they'll join the midfield rotation, only this time it won't be from defence.
Can't be full can it? Geelong can fit something like 10 midfielders into their side and give em all a decent enough amount of midfield time. We've got what? Fyfe, Tucker, Mundy and Brayshaw? Probably could get away with just bringing the 1 in for a Banfield/Schultz and going in with the 6 defenders though.
I'm just big on Conca playing as an inside mid. I don't mind trying Tucker in there but Mundy/youngsters aren't going to get the job done against many teams. If Fyfe goes down we could legitimately finish last with the weight he currently shoulders in the midfield.