In 1678, he became a hoshi (successor of hoshu) of his eldest brother Jyonyo, changed his homyo to Ichinyo and his imina to Kokai again, and was assigned to the 16th hoshu in the following year.
そして、1678年（延宝6年）に長兄・常如の法嗣（法主後継者）となり、法名を一如、諱を光海と再度改め、翌年、第16代法主を継承した。