...I'd like to see videos where an effect is caused in the uke that would be definitive of what aiki is and is not.
If I can achieve it, I will video it for discussion!
Looking forward to your vids.
Meanwhile, I'd say the clips of William Gleason, posted earlier in the thread, are excellent examples of what you describe. He looks like he's caught the drift and I don't think his uke exaggerates.
And it looks like Gleason Sensei has advanced considerably since last August.