I am not Rennis, but I am presently researching on kotodama for my next few columns and I can tell you that, from the evidence, Ueshiba's view of kotodama was a blend of borrowings from Esoteric Buddhism and Deguchi's Reikai Monogatari
Mr. Buchner, could you please go into further detail of how Osensei was just winging it and other points in your statement. I'm assuming that you have knowledge and access to things in Japan that I can't get a hold of. Please stir up the pot!! Would love to learn more.