It's cool that Walter brought in judo. I've also done quite a lot of judo and it has always seemed to me to be much easier to explain in terms of physics than aikido.
By the way there's a lot of discussion about kokyu ryoku in the Yoshinkan and aiki thread (which for some reason was posted under Non-aikido martial traditions). There's some disagreement on the terminology. In the Aikikai line kokyu ryoku means breath power - and that means everything in aikido. O Sensei told my teacher he had to get it at all costs and that is what my teacher told me. In some of those other lines kokyu ryoku seemed to mean just a component of what they were apparently calling aiki. But the goal is perhaps the same.