If he were a son of a concubine related deeply to Nobutaka(信孝) and Narimasa, it would be explained why he had suffered an indignity in the Toyotomi government period and he had been treated very well as Koke (master of ceremony in Edo bukufu) after the foundation of the Edo bakufu (Narimasa SASSA was approaching Ieyasu in ways such as Sarasara Toge Goe (over the Sarasara Pass) in the period of hegemonic establishment of Hideyoshi).
信孝、成政と縁故が深い側室の子とすると、豊臣政権時代の冷遇、江戸開幕後に高家に取り立てられ厚遇されたことの説明がつく（佐々成政は秀吉の覇権確立期にはさらさら峠越えなど、家康に接近する姿勢を取っていた）。