The last major group consists of students of Yukiyoshi Sagawa (佐川 幸義, "Sagawa Yukiyoshi", 1902–1998), who was once considered to be the successor to Takeda Sokaku (should Tokimune not have survived World War II). Sagawa ran only a single "dojo" and taught a relatively small number of students. He began studying Daitō-ryū under Takeda Sokaku in 1914 after first learning the art from his father, Sagawa Nenokichi (1867–1950), who was also a student of Sokaku and a holder of a "Kyōju Dairi" (teaching license) in the system. Although considered by many to be one of the most accomplished students of Sokaku, Yukiyoshi Sagawa received the "kyoju dairi" in 1932—but did not receive the "menkyo kaiden" (certificate of mastery) of the system's secrets, as during the time he practised under Takeda Sokaku, the highest licence was not the "menkyo kaiden". Sagawa often served as a teaching assistant to Takeda and traveled with him to various locations in Japan teaching Daito-ryu. He further developed the art of applying Aiki and is said to have remained powerful until very late in life, and – as a consequence of the success of "Transparent Power" – was featured in a series of articles in the Aiki News magazines prior to his death in 1998.