Interesting topic. Stevens Sensei also uses more of a kamae stance than a hamni stance I believe...at least in terms of the foot position.
An important note: Kamae in the yoshinkan is a training stance, not a fighting stance. When reviewing the bokken training in another style (aikikai sub-group) my stance stood out a lot, and the instructor took some time to explain the difference to me. I really like his explanation, but of course I returned to my own stance when I went home. But now I have a chance to practice hamne on my own, and when in aikikai settings.