In a way, the Hayami-ryu school is believed to have originated in the event that Sotatsu was allowed to establish a branch school in order to be delegated to Okayama on behalf of Soshitsu when Soshitsu received a request for outside services of the tea ceremony at Ikeda family's residence in the domain of Okayama.
速水流の起源については、一燈宗室が岡山藩池田家から出仕の要請を受けた際に、分派を許した上で代理に宗達を遣わしたという説がある。