I get the impression that there are not that many photo's of him doing techniques either? Not as much as with O Sensei anyway.
I'm sure there are more photos. Most likely in private collections...Mr Pranin might even have some still unpublished ones as well. I know he has some interesting information that has of yet been made public(he seems that he does not want to step on any toes). One day there might be many shocked people out there.
All The Best,