Those are from the Noma Dojo series of photographs.
Although there are hundreds of photographs in this series, the groupings have been lost so we lack context for individual frames. It is very difficult to draw conclusions about individual poses and there were no written descriptions of what is being portrayed. Therefore it is very easy to project all sorts of interpretation onto this series of photographs.
I'd like to know more about this. Is there anywhere I can see more of the pictures in context?
I managed to find this book
Budo: Teachings of the Founder of Aikido
but I was wondering if you knew of anymore resources?