I think 3 ruckmen would make us too inflexible. While Roughead may be able to play multiple positions, he wouldn't offer us a big enough difference IMO to change the game up for our benefit. I think what you need from the sub is someone who can come in when others are tired and just go full pelt for a half. This means i would like an attack minded running player, like a Sherman. Someone you throw in and tell to create. I woud have nominated Veszpremi as a chance for this role as his fitness is limited and he fits the attacking type of player I want but going by recent reports he might not be able to push as high into the midfield as I would prefer.