However, Emperor Murakami accepted Imperial Prince Norihira as the Imperial Prince, and Koretada was promoted to Sangi (consultant) during a Jimoku (ceremony to inaugurate court officials) the same year, promoted to the rank of Jusanmi (Junior Third Rank) in 967, and skipped four Joro (higher ranking officials) to become the Gon Chunagon (a provisional vice-councilor of state).
だが、憲平親王を皇太子と定めた村上天皇の強い意向で、同年の除目で参議に進み、康保4年（967年)に従三位に昇り、続いて上臈4名を飛び越して権中納言に転じる。