Sean Murphy's research deserves more

[Ivan De Mey]

Back to Prayer Man. If it is not Oswald, who is he? It's obviously a white male, and most likely an employee of the TSBD.
From the people in bold on Tracy's list we can erase the women and non-whites. That leaves:

Campbell, Ochus Virgil Vice president of the TSBD On Elm in front of TSBD
Frazier, Buell Wesley Order filler at TSBD TSBD, front steps with William Shelley, Lovelady
Lovelady, Billy Nolan Stock clerk, first floor, probably man seen in doorway in Altgens photo TSBD, front steps (with William Shelley, Sarah Stanton)
Molina, Joe R. Credit Manager at TSBD, second floor TSBD, front steps with Otis Williams and Pauline Sanders
Shelley, William H. 37 years old, Oswald's supervisor TSBD, front entrance (Billy Lovelady in front of him, also near Frazier, Sarah Stanton and Carolyn Arnold)
Truly, Roy Sansom Superintendent TSBD TSBD, front entrance (with Ochus Campbell)
Williams, Otis Neville Bookkeeping supervisor, TSBD Front steps TSBD

Roy Truly wore a suit, no match
Lovelady can be seen together with Prayer Man in certain frames, so it can't be him
And Buell Wesley Frazier is standing next to Prayer Man:

[ATTACH=CONFIG]5554[/ATTACH]

That leaves:
Ochus Campbell
Joe Molina
William Shelley
Otis Williams