This has all been laid out in Stan Pranin's work - starting back in the 1980's. I'm not going to go back and make the same arguments again.
I'm not sure how much more clearly you can attempt to lay it out and have it skated around... Props to you, because I'm exhausted just from reading it.
Ueshiba had a lot of students, a good many of which were serious in their training and looked high and low for the "secrets" both while he was alive and for decades after, yet only a handful have any notable measure of the skills that he had. There are only so many honest conclusions one can draw from that...