I was on Okinawa 86-87. Kise Sensei student. Passai had a circular step in it. We also kind of circled the first step in naihanchi. Good info about Seiki Arakaki and the circle steps.
The Tae Kwon Do group I now train with uses crescent stepping. I keep thinking about opening and closing the kua from my Tai Chi studies andexpanding and contracting.