These experienced martial arts where stepping into Aikido, taking from Aikido. I think it says something strongly about Aikido. These experience martial artists, were they going to Aikido to evolve their arts? O'Sensei didn't go to them.
You really have to see Aikido as a complete art. Maybe not as brutal or lethal as some other arts. But as equally humane as most other modern martial art of its time. I don't think we should measure an art by its brutality, but by its humanity. That is evolution.