Main round change of preferences have now closed. He can still change his preferences, but he will only be considered in the late round. What I suggest he does is keep his first preference as it is, that way he will be considered for the amin round, and then change it after the main round. He will not be guaranteed an offer in the late round, but at least he will receive an offer.
Please see
here for more information.
EDIT: I don't even think he can change his preferences until the 17th.