Chris, I think that a lot of these things are just getting started and your questions are valid one. Graham states his perceptions, just as everyone does, and those are the other side of the coin. On my part, I would say that there is simple physics involved, whether using athleticism or internal-strength (neijin), so I would actually take a third position from you or Graham on, for instance, the old Bagua guy. Hara is always assumed, but in the case of the old guy there is something else involved. Keep your mind open.
FWIW
Mike Sigman