Peter A Goldsbury
Finally, since you are talking of cover-up and conspiracy about how critical Daito-ryu was to aikido, I think you need to consider another possible cover-up, which concerns Morihei Ueshiba's obsession with deities, kotodama, and establishing the correct harmony between the 'three worlds'. This is why I believe you need to read the English translation of Kisshomaru Ueshiba's biography very carefully indeed. Kisshomaru's biography is much more subtle than that of John Stevens (in either edition).
As always, best wishes,
For this part of my thread, I was dealing only with the martial background of Ueshiba. I haven't touched upon the spiritual background and I would not be surprised to find a similar changing of "history".