I meant to post these 2 links on the thread as background about the way of the cross but they fit well here. They are discussion of Chinese qigong but seem to have a lot of similarity to what Ueshiba was saying. They discuss qigong as a path of "destiny". There seems to be two components, acting in accordance with the will of heaven and internal alchemy. Uniting heaven, earth and man (being a bridge between heaven and earth) is to act in accordance with the will of heaven and thereby act out one's will (actually heaven's will) in the world. In turn, practice of inner alchemy (qigong) will enable one to develop the will that creates changes in the world (or others) ie to be the sage that changes the world through non-action.
I think the second link is probably only readable after reading the first:
Chris, I am a little confused. You talk about standing on the bridge as being in the centre of the spiral between In and Yo but is that more a description of what happens when the two gods step down off the bridge and descend to earth? It doesn't seem to matter much, the way they circle around the land they have created seems a strong echo if not a direct retelling of the events on the bridge.