I am currently reading this book and trying gain what insight I can in to his view of O'Sensei and Aikido. It's clear that O'Sensei was motivated throughout his life by a spiritual quest. Coming from outside Japan and trying to understand the concepts he was working with may be beyond me.
Meanwhile, can I move my feet correctly, maintain my center, and execute a kokyu-nage?
That is, frankly, a much more pertinent question. Aikido is O Sensei's message to us.