About the Nanbokucho-Seijunron (argument on legitimacy of either Northern and Southern Court), he argued that the transition, in which the North people (samurai class) overpowered the Ochoto group (the South people [survivors of the extinct Southern Song dynasty] or court noble class) who were inquisitive and contraction-minded people, became the spiritual backbone of the time.
南北朝正閏論においては北人（武家方）が苛察収斂な王朝党（南人/公家方）を圧倒して時代精神になったと論じるなどした。