However, some tales have errors; for example, "Buko-den," "Kokura Hibun" and "Heiho Taiso Bushu Genshin-ko Denrai" claim that the Yoshioka ended due to the defeat at the fights with Musashi, however, according to other materials including "Suruga Koji-roku" (Old Record of Suruga Province), Yoshioka existed after the incident.
『小倉碑文』や『兵法大祖武州玄信公伝来』『武公伝』には武蔵との戦いで吉岡家が絶えたとあるが、吉岡家がその後も存続したことは『駿河故事録』等、いくつかの史料から推測できる。