Hi Russ,
Very nice and clever analysis of a very difficult concept to apprehend. I tend to agree with almost everything you say, but for your comment on the lack of depth in the content on some of HCB pictures in Russia. I am wondering to which photos you are referring here.
Besides, to me, street photography can involve humour, surrealism, poetry (Doisneau!), drama and/or many other things. In fact, it's a pretty big bag. As in other art, I would say that a good street photo is a one that trigger some sort of affect or cultural or whatever resonance in the viewer.
Once again, congratulation for your nice paper
Francis