Re: Iwama bokken vs. "the other" bokken
First of all: If Ueshiba only taught bukiwaza in Iwama, why did he issue a aiki-weapons certificate to Hikitsuchi in Shingu?
Second: Itīs not exactly like Ueshiba invented the bokken, there has always been a lot of different kinds of bokken out there.
Third: Are you sure that he didnīt use a Kashima Shinto Ryu-bokken? After all, he entered Kashima Shinto Ryu and at least the first kumitachi is modeled after a Kashima kata.