Also, according to "Nancho Seito Koi Keisho Ron" written by Sekizan FUJIWARA, it was said that the Emperor Gokameyama (Prince Yoshinari) of 副統 made peace by falling into the snare set by Yoshimitsu ASHIKAGA and therefore after the unification of the Southern and Northern Courts in 1392 imperialist samurai (warriors) across the country lost legitimate reason to side with the Legitimate Succession of the Southern Court, then Legitimate Succession of the Southern Court followed a course of decline.
また、藤原石山『南朝正統皇位継承論』は、副統の後亀山天皇（熙成王）が、足利義満の謀略に掛かって講和したため、1392年（明徳3年）の南北朝合一以後、全国の勤皇の武士たちは南朝正統に味方する大義名分を失い、南朝正統は衰微の一途をたどったとしている。