Good morning!
A brief recap:
*Prayer Man remains in his same specific position, holding down that space throughout several different filming sequences (Wiegman, Cook and Darnell)
*In each of those filming sequences his shaggy shirt remains un-tucked, with his bare forearms fully exposed (contrary to the business attire of Bill Shelley).
*Note Prayer Man is still holding the same position he has maintained throughout those several different filming sequences, even after Bill Shelley has left the front entrance.
Brb...
Continuation...now turning our attention to Mr. DuVall, let's take the following into consider: In his Sixth Floor Museum interview shares a key detail he observes from his vantage point while viewing the P. Parade about seeing a black vehicle parked aside the TSBD on his left, his words not mine. Mr. DuVall or anyone else for that matter holding down Prayer Man's position --within the inward enclosure of the front entrance--couldn't see through concrete, let alone specifically describe the colour(s) of any vehicles alongside of the building on Houston Street.
Brb...
Prayer Man was framed. The wrongly accused did not shoot anybody. Anybody.