Re: Photograph of O-sensei's feet?
One thing I will say is that both Morihei's and Akuzawa's feet look healthy in contrast to Akuzawa's uke's feet, which look mildly deformed. All to common in the modern, post-industrial world due to our healthly habits like wearing shoes and sitting in chairs all day.
Again, not sure this has anything to do with "internal." I am still hoping to hear from Hunter.