The young man in front of the red curtain and the young man behind Richard and Joseph appear to be the same young man. 'David' or not, doesn't seem to matter...that's one more boy identified. Sort of. Ruth said that the Kenyan had other children in the home in Nairobi, one was a cousin he was paying to educate, and sometimes there were so many people in the house she didn't know their names and would stumble over them in the passage.
The real fly in the ointment seems to be that neither of the two boys in the image that Mark put on his website, can be identified conclusively as 'David and Mark.'
