(2) Where this Constitution vests in any person or authority the power to make any appointment to any office, a person may be appointed to that office, notwithstanding that some other person may be holding that office, when that other person is on leave of absence pending the relinquishment of the office; and where 2 or more persons are holding the same office by reason of an appointment made in pursuance of this subsection, then, for the purposes of any function conferred upon the holder of that office, the person last appointed shall be deemed to be the sole holder of the office.