Another great post. I suspected Juji might have multiple layers of meaning (Physical, ki, spiritual) like Osensei's other writings. Particularly I though Juji might refer to energy crossing from one side of the body to the other at an intersection, maybe front-to-back.
So, I hunted down the Aunkai definition. This interview very similar stuff on 6 directions etc to Osensei. See 6 th post.