According to one theory, the Nanbu clan used Masasue as a puppet player, to control the Ando line families settled in a wide range of the northern maritime area, and this policy contributed to the stabilization of the northern maritime area and the penetration of the bakufu's influence into this area, and from this point, the Shimonokuni family was discontinued and the Hiyama Ando clan emerged from Masasue ANDO of Shiokata, in return.
これを、南部氏が政季を傀儡とし北方海域の各地に広く分布していた安藤氏の同族を掌握したため、北方海域の安定化と幕府権威の浸透につながったとし、このとき下国家は断絶し潮潟安藤政季から新たに檜山安東氏が始まるとしている説がある。