Re: Seiza by ranks?
Our dojo doesn't make a point of lining up in rank order, but I had the chance to train with a great group of folks in Reading, UK, and it was the custom in their dojo to sit in rank order. Being a guest, and being fairly junior in my home dojo anyway, I erred on the side of caution and sat below the guy in the sweat suit, and that seemed to suit folks there.
However, I did notice that in general, when pairing up to train, folks didn't mix up very much; they tended to train within their rank groupings more or less and this was easy to see because they used a colored-belt system. Is this the way it usually works in sit-by-rank dojos?