There was another Okita in the Shinsengumi, a man called Jonoshin OKITA, who had been recruited by Hijikata in Edo in 1865, and there is a theory that the 'Okita' in the register of deaths may be Jonoshin.
なお、新選組にはもう1人「沖田承之進」（慶応元年4月、土方らが江戸で募集した隊士の1人）という沖田姓の隊士が居り、過去帳の「沖田氏」は承之進の方では無いか、との説もある。