Koichi Tohei (20 January 1920 – 19 May 2011) was a first one to be promoted to a 10 Dan by the Morihei Ueshiba ever. He taught people like Hiroshi Tada, Seigo Yamaguchi, Mitsugi Saotome, Sadateru Arikawa, Kazuo Chiba, Yoshimitsu Yamada, Steven Seagal and many others.
Yasuno Masatoshi was born on September 7, 1948, in Kanazawa city which is in the Ishikawa prefecture, Japan. Yasuno Masatoshi is a Hombu Shihan with an 8 Dan Aikikai rang and is considered to be Yamaguchi Sensei’s technique heir along with the Seishiro Endo, Yoshinobu Takeda and Christian Tissier.
Mokuso is a Japanese term for silent meditation. The first kanji reads as “Moku” and means silence or stop and the second one is “So” and means to think or focus. Mokuso is a common way to start and to end a training session in the Japanese Martial Arts and especially Aikido.