Not sure whether Marosi is fit enough for the team yet, but he's vocal so if he plays I'd give it to him. No-one else on the team seems to have a real voice, so the alternative is to give it to someone who leads by example, which probably leaves Hamer, Dabo, or as a wildcard O'Hare. Longer term, assuming he signs permanently, I wouldn't be surprised to see Sheaf given the armband at some point.