Although there is a theory that NASU no Yoichi entered into priesthood and retired because he had a conflict with Kagetoki KAJIWARA when the hunting session Nasu Makigari was held in 1193, only 'NASU no Taro Mitsusuke' appeared in a description about the period before and after that in "Azuma Kagami" (The Mirror of the East).
なお、建久4年に催された那須巻狩の際に、那須与一が梶原景時といさかいをおこし、出家遁世したという説があるが、『吾妻鏡』のその前後の時期の記述には「那須太郎光助」しか登場しない。