I posted the first post with the idea of laying out the whole system as I see it, being unable actually to do most any of the feats of power. I can do Ark's push-out pretty well, but that's about it for me.
This is something Dan said in the Ueshiba's Aiki thread that, for its bluntness, made me turn my head, so to speak, and I think sums up the entire thing really nicely:
I always call it IP/aiki. Internal power or strength is created from a balance of ki in yourself. From there you create aiki between you and someone else.
A quick study of that is Ueshiba's discussion of Heaven/earth/man. Where he notes that after you can manifest the energy between heaven and earth staning on the golden bridge do you release the mountain echo.
This is a well known concept and has to do with a balance of opposites and what it does to your body to remove slack and be full and stand suspended, thus any force-in "echos" back-out. Kuzushi on contact that can then be manipulated.
I am not much for tricks. Once you know how these things work there are many ways to display them. Some prefer to use power displays. I occasionally do that too. But power displays while profound and exceptional (and Ark is very good) are not where I am at. I prefer a softer approach-don't show them your power and dissolve their strength while entering in. Ark can do more than those videos show. We are only discussing what he chose to show in a particular video.