The difference is Ueshiba changed 'everything' after the war
Thank you for answering my question.
I don't see this global cange when looking at what we can know about the history of aikido.
And I don't "experience" it when practicing with my teacher who has practiced with the late Sugino Yoshio (besides other teachers).
So I don't agree with your statement. Be it sitting over my books or be it practicing on the tatami.
I myself think that the assumption of a global change after WWII just makes it easier for us, to - seemingly! - understand what Ueshiba thaught and did.