It is also insisted by some people that Masatora's son was Masatatsu KUSUNOKI who was a scholar of military science and who had become a foster father to Sessho YUI, but there is no positive proof.
一説には由比正雪の養父となったとされる軍学者・楠不伝（楠木正辰）を正虎の子とするものもあるが、確証は無い。