May I ask a little about Aikido history: O Sensei was once invited to teach at the Kodokan by the founder of Judo, Dr. Jigoro Kano: did he accept?
At the time Kano Sensei was trying to consolidate the traditional Martial Arts of Japan, to help preserve them. That is why he asked O Sensei to come to the Kodokan to teach. But O Sensei refused: he felt that Aikido and Judo were so different that they should not be classed together. So instead Dr. Kano sent three of his senior students to study under O Sensei – Master Mochizuki and Master Murashige, and one other. I can’t recall his name. They studied with O Sensei but returned every so often to the Kodokan to meet with Dr. Kano.