Timothy Walters Kleinert
Maybe I'm reading into the Akuzawa clip---easy to do since you can't hear what he's saying---but he shakes his head, so it seems like a negative example. Maybe Rob can jump in and explain what was going on in the clip. But here's what I think he's doing:
1) He's getting under uke's attack (as Mike said).
2) He's bringing his elbows together. This aligns his forearms with his body, which is a pretty strong position. It also has the added benefit of twisting uke's arms out of alignment.
3) Lastly, with his arms "locked" in place, he's using his legs to lift up uke.
This was the way I was taught to execute kokyo-ho. It works. With a little practice, you can lift uke's arms "without any effort" from your upper body.
But it's not internal movement. When Akuzawa does it the second time, you don't see him doing any of the above. He "simply" raises his arms.
Thought I'd clarify this a bit.
Wow...that's an old vid, plus I caught a lot of flak for it cuz of what he said in the vid, lol.
Anyone that understands Japanese and is interested can subscribe to my youtube where it still has the audio in it.
That being said, a quick summary of what he said:
"And when you raise the arms, you don't "haru" or "tense" the fingers like you see some people do in Aikido. Its simply too slow if you do this."
The second example
"You simply raise the arms, everything goes on inside, but especially the backside is important, energy must pass through the back"
He's pretty particular about never "lifting" the Uke using the feet by pushing against the ground with the feet, that implies bracing. Rather you should have your opponent at the moment of contact. You don't have to be physically under them at all to do this, since all the movement/adjustment happens mostly inside the body.