Is the man on the left the same man on the left of your second photo?
These are Elliott and Fry photos and I have to admit, I haven't seen any of them before. I believe the National Portrait Gallery in London has their archives, although I seem to remember the only relevant photo featured in their online stuff was of Cody.
Looking at the Kasebier book, I think the taller man next to Joe Black Fox is High Heron; the man standing at the left of the photo may be Amos Little. Short Man or Has No Horses sitting at the far right?