Shorinji Kempo
Many sources claim that Doshin So trained in Hakkō-ryū Jūjutsu and that techniques from there was incorporated in Shorinji Kempo. However, the Shorinji Kempo headquarters has no records of this and the records of the Hakkō-ryū organization merely show that he sat in on a few sessions. Any implication that Hakkō-ryū may have had on Shorinji Kempo would have been very minor since he got back to Japan in 1946 and Shorinji Kempo was founded the following year (Hakkō-ryū was founded in 1941 when Sō was still in Manchuria).