When Sadataka IWAKI, Yoshishige's third son and also a younger brother of Yoshinobu, was adopted by the Iwaki family as the heir in 1590, Kenitsu had control over government affairs of the Iwaki clan as Sadataka's assistance.
1590年、義重の三男で義宣の弟である岩城貞隆が岩城氏に養嗣子として入ると、顕逸は貞隆の補佐として岩城氏の政務を取り仕切った。