Most likely there is a lot of persons , Theymos (won't make sense to give him control of forum unless he trust him for real) , Sirius ( who created forum with Satoshi and control Bitcoin.org I assume ) and Gavin too if he isn't already Satoshi but I don't think he is because it would be too obvious .
but Gavin claim he was in contact with Satoshi in email so it would be kinda fucked up if he was emailing himself also seems like he dissapeared once they CIA asked to talk to gavin