My bad on the use of the word 'vestibule' when I meant the lobby at the front entrance (rookie mistake) but there does seem to be quite a few references to an encounter as Oswald was on his way out of the front entrance which I can't discount at the moment until I've got a better grasp of things. I'm not familiar with the Prayer Man stuff but if it means identifying the shadowy figure in the corner as Oswald I would need to see something really convincing to get me there. As I said somewhere else, to me it looks like that person is lighting a cigarette (or holding some kind of light source up to their face which I'm interpreting as a match). The problem I'm having at the moment is that there are so many contradictory pieces of testimony/statements/reports etc. that it seems possible to support almost any scenario.
The big problem I'm having at the moment is that if Oswald really is a patsy who is being set up it doesn't seem like anyone is monitoring him or controlling his movements. It's like he's free to go anywhere he wants which means he could be outside be photographed or talking with a group of people at the time of the assassination. Not a great plan. Also, if it is this massive operation it all seems to hinge on whether Bonnie Ray Williams finishes his chicken lunch in time.