On the other hand, the book also reported that he was well informed about Yusoku kojitsu (court and samurai rules of ceremony and etiquette), and when FUJIWARA no Sanesuke, who later became a master of ancient practices, was serving under Naritoki as Chugu daibu (Master of the Consort's Household) of Chugu (Empress) FUJIWARA no Junshi at that moment, Sanesuke highly described Moritoki as a 'well qualified person for the duty' (the article of April 12, 982 in "Shoyuki" - diary of FUJIWARA no Sanesuke), and frequently asked for Naritoki's instruction (the articles of April 27 and June 1, 993).
その一方で有職故実に通じており、後に故実の大家となる藤原実資が当時中宮藤原遵子の中宮大夫を務めていた済時の部下となった際に「可堪任者」と高く評価（『小右記』天元(日本)5年3月11日条）して、しばしば故実の教えを乞うた（同正暦4年3月28日・5月4日条）ことを記している。