However, although it was written later, 'Shonai Jinki' (Shonai war chronicle) has an entry stating that Yoshihiro and Tadatsune had conspired together while Yoshihisa gave his consent to the plan.
しかし、後世の史料であるが「庄内陣記」には義弘・忠恒が共謀し義久が同意を与えたという記述がある。