See my previous post - the second in the thread.
He became head of the dojo after his father in law died - he had been a member of the dojo before that. He got quite a bit of support from the Shihan of the Osaka Aikikai until he started getting over confident and cocky. He was not the first Gaijin run a dojo in Japan.
Juso as a centre of Yakuza activity - not.
Occaisional run in with Japanese with an attitude - probably but he is a big boy.