If these IDs of the people in the Altgens photo and Wiegman film are sound (apart, of course, from Ms Stanton, whom we know to be to Mr Frazier's left at this time)-------------

-------------then we can understand that, between Hughes and Wiegman,
A) Mr Lovelady, order to follow the motorcade down Elm St, has stepped back to a higher level and near the centre of the stairway
B) Mr Shelley, in reaction to Mr Lovelady's movement and/or in order to follow the motorcade down Elm St, has stepped back to a higher level and a little further east.
Prayer Man (Mr Oswald) remains in the same position from Hughes to Wiegman.
From Wiegman to Darnell, he will remain in the same spot, though his posture may well change:


Now! What happens next?
Let's hand over to Mr James Jarman (HSCA interview 9.25.77):
JARMAN: Well, there was a Billy Lovelady standing out there, he was on the steps, see.
INTERVIEWER: Oh.
JARMAN: And, Oswald was coming out the door and he said the police had stopped Oswald and sent him back in the building, Billy Lovelady said that Mr. Truly told the policeman that Oswald was alright, that he worked there, so Oswald walked on down the stairs.If that's Mr Lovelady near the bottom west of the steps in Darnell, then we can work out the sequence of events:
-------Officer Baker rushes past Mr Lovelady and up the steps
-------Mr Lovelady turns around to look up after him
-------He sees the police officer grabbing hold of Mr Oswald (whom Mr Lovelady notices now for the first time) and pulling him into the vestibule, shouting, 'Do you work here?'
-------Mr Lovelady misunderstands the encounter------Mr Oswald is not 'coming out the door', he's been there all along!; and all Officer Baker is doing is seeking assistance from the first man he can grab
-------Mr Truly, meanwhile, has followed Officer Baker up the steps... he offers to give the police officer the assistance he is seeking ('Yes he works here, officer, but I'm the building manager, I'll help you').
Now!
Mr Lovelady's mistaken interpretation of this exchange between Mr Oswald and Officer Baker-----------i.e. he thinks the officer has aggressively 'stopped' Mr Oswald from leaving the building and Mr Truly has stepped in to vouch for his employee------------is
exactly the story that DPD will be telling the press about later this day:
Oswald was
stopped by one of our officers as he tried to leave the building, but the officer, who was rushing into the building,
let him go when the building manager told him Oswald worked there.
Friends, the coincidence between Mr Jarman's account and the first-day DPD line is no coincidence at all!---------------> Mr Oswald went out to watch the Presidential Parade.
---------------> He was standing beside Mr Shelley as the President was passing.
---------------> Just after the shooting, a police officer
did come running in to the 1st floor, grabbing Mr Oswald and pulling him into the vestibule.
This is the real 'lunchroom incident', and Mr Oswald told Captain Fritz all about it!