Peter Rehse wrote:
I seem to remember something about Ueshiba M. being given permision to use the family crest (Mon) of another man so that Takeda S. would teach him. If I am going off the deep end on this please let me know. Entirely possible that I am confused.
IIRC (without checking), Yoshida Kotaro (who introduced Ueshiba to Takeda) lent him the use of his family crest for the purposes of the introduction.