This dramatic confinement was designed by the Mori clan to increase its pressure on the retainers of the old Amago clan and strengthen its lordship over Izumo Province, such that Hisasuke MITOYA who had been a member of the old Amago's retainer group also suffered exile in the same manner as those of the Misawa clan.
この幽閉劇は、毛利氏による旧尼子家臣団への締め付けと出雲国の支配強化が狙いであり、三沢氏同様、旧尼子家臣団でもあった三刀屋久扶も追放の憂き目にあっている。