Re: Ueshiba's Aiki
I think it's important to realise that the concept of Aiki was around long before O'Sensei used it to describe his form of jujutsu.
In his book "The Fighting Spirit of Japan" E. J. Harrison describes meeting a master of aiki. Bear in mind this was published in 1913 - well before O'Sensei came to prominence.
IMHO O'Sensei saw himself as a channel for Aiki - but perhaps couldn't explain it himself.