Well, I guess what I'm saying here is, lot's of people call different things Aiki. Lot's of people can lay legitimate claim to why what they call Aiki is correct.
I'm all for talking about how we (you and I, or Aikiweb people) will choose to define Aikido, but that will still simply be our
On your list of things above:
1. I can't replicate what Ueshiba did when he encountered Tenryu (and others).
2. I can't replicate sitting on the floor cross legged and not be pushed over.
3. I can't replicate what Tomiki did when he held out his hand for judoka to throw him and they couldn't.
4. I can't replicate what Ueshiba did to Nishimura with the folded paper (which, btw, Takeda also did to show off his skills).
5. I can't replicate Ueshiba not being lifted off the floor by four strong men.
6. I can't explain how Ueshiba got great in less than 10 years (which btw, Tomiki and Shioda also did).
7. All the people in modern aikido who have gone out and gotten their hands on someone who has aiki, have come away with the realization that everything they knew about aiki was wrong. Every single one, including shihan level aikido people.
2-5 can be done using angle and alignment. There are a number of people who preform these things regularly. Several of them fall into the area of tricks and can be learned in minutes.
A study of Lulu Hurst will reveal many of the same, and some even more impressive body skills that Ueshiba demonstrated. These things will be found to be simple application of leverage, body weight, mental suggestion and timing. Natural parts of martial arts training, found in almost every system.
When we train in Aikido we enter into a compliant state of mind, we want to take part in the magic, so we participate in it. There is nothing wrong with this. It can help us to learn, and learning to put someone into this state of mind can be, martially speaking, very useful indeed. I believe Ueshiba got himself out of some very difficult situations thanks to this skill.
Anyways, I'm getting long winded here. Basically we have to decide what it is that we are going to call Aiki. Then we can talk about it.