There is an another theory that Tsunashige's father was killed because he supported a younger paternal brother of Yoshimoto IMAGAWA, Ryoshin IMAGAWA (Genko Etan), in the Hanakura War which was an internal conflict of the Imagawa family; he then fled to Ujitsuna.
また、天文(元号)5年（1536年）に父が今川家の内紛である花倉の乱で今川義元の異母弟・今川良真（玄広恵探）を支持したために討たれ、氏綱の元へ落ち延びたという説もある。