Re: Is aiki a clash of forces?
I think what he is saying, while he's talking about boxing, is that he believes that Taiji, offers a "heavy" punch, and that modern boxing offers a quicker punch. I believe he goes on to say that, the Taiji punch wouldn't be very good for boxing, because you couldn't punch quick enough using it. And in the boxing match you would just end up getting hit in the face. I could be wrong, of course, but I also think he was showing how the heel being up or down and the way you are connecting with the ground will effect that difference.
I also believe he is saying that dantien means- power zone, or core. And he pointed out what that area was. This is how I would describe it as well. He also talked quite a bit about structure, and how structure plays an important roll in making power.
If your understanding of this is different please share. I like having something that we can all view and talk about. Makes figuring things out much easier.