
I believe Joe Molina is the man labelled with the letter "A" in the pic above., the man covering his face with his hands.
He is wearing a white shirt, appropriate for his office role.
Below is a close up of the steps, heavily contrasted in order to highlight white (note the woman in the white dress who I believe is Karan Hicks)

The bald man appears to be wearing a dark shirt.
The only bald man wearing a dark shirt stood on the front steps was Lovelady who was stood, more or less, in the same position in the Altgens 6 picture.
IMO the picture shows the moment Gloria arrives at the front steps and is telling Lovelady about the shooting. She has just seen the President's head blown off a races back to the TSBD building.
From Shelley's affidavit taken the day of the assassination:
"I ran across the street to the corner of the park and ran into a girl crying and she said the President had been shot. This girl's name is Gloria Calvery..."From Lovelady's WC testimony:
Mr. LOVELADY: I thought it was firecrackers or somebody celebrating the arrival of the President. It didn't occur to me at first what had happened until this Gloria came running up to us and told us the President had been shot.
Mr. Ball: Who was this girl?
Mr. Lovelady: Gloria Calvary.From Joe Molina's WC testimony:
Mr. Ball: Do you know a girl named Gloria Calvary?
Mr. Molina: Yes.
Mr. Ball: Did Gloria come up?
Ms.. MOLINA. Yes, she came. I was in the lobby standing there and she came in with this other girl.
Mr. Ball: What did she say?
Mr. MOLINA. She said "Oh, my God, Joe, he's been shot." They were both horrified. I said "Are you sure he was shot?" She said "Oh, Joe ,I'm sure. I saw his hair fly up and I'm sure he was shot" something to that extent.Gloria was stood on the north side of Elm street "about half way between Houston Street and the Triple Underpass" watching the motorcade with her friends and colleagues Karen Westbrook, Karan Hicks and Carol Reed.
She was stood a matter of feet away from the limo when the first shot rang out and she had a close-up unobstructed view of JFK when his head literally exploded. The traumatised Gloria immediately raced back to the TSBD building crying and hysterically telling everyone she met that the President had been shot.
Other than the three mentioned above, who knew Gloria by name, there are others who report a hysterical woman loudly telling people about the shooting seconds after the assassination.
WC testimony of Buell Frazier, who was stood at the top of the steps:
Mr. Ball: Did anybody say anything about what had happened, did you hear anybody say anything about the President had been shot?
Mr. Frazier: Yes, sir; right before I went back, some girl who had walked down a little bit further where I was standing on the steps, and somebody come back and said somebody had shot President Kennedy.
Mr. Ball: Do you know who it was who told you that?
Mr. Frazier: Sir?
Mr. Ball: Do you know who the girl was who told you that?
Mr. Frazier: She didn't tell me right directly but she just came back and more or less in a low kind of hollering she just told several people.This is surely a reference to Gloria, when she comes back to the steps and is telling people about the shooting of the President. Her voice is loud enough to be heard by most people on the steps, including Frazier on the top step. She is clearly distressed and her voice is "a low kind of hollering".
There are other reports of an 'hysterical' woman in the area near the front steps talking about the shooting of the President. It is clear she must have come from near where the shooting happened and made her way back to the TSBD building as those in this area had no idea the President had been shot.
From the WC testimony of Dallas police officer Joe Marshall Smith
Mr. Smith: Yes, sir.; and this woman came up to me and she was just in hysterics. She told me, "They are shooting the President from the bushes." So I immediately proceeded up here.
Mr. Liebeler: You proceeded up to an area immediately behind the concrete structure here that is described by Elm Street and the street that runs immediately in front of the Texas School Book Depository, is that right?
Mr. Smith: I was checking all the bushes and I checked all the cars in the parking lot.Smith was working on the corner of Elm and Houston. Immediately after hearing shots he makes his way down the Elm Street extension and bumps into this 'hysterical' woman. Gloria would have run back up Elm Street to the 'spur' where she runs into Shellley and then across the Elm Street extension to the front steps of the TSBD building. Their paths would have crossed on the extension somewhere in front of the steps. I strongly suspect this 'hysterical' woman is Gloria because she is aware that the President has been shot. After this interaction Smith races up the extension towards the concrete pergola and the railroad yard.
If the woman is Gloria then it is possible to use the film record to establish how quickly Gloria got from her position on Elm Street back to the TSBD building steps.
Below is a still from footage taken by Jimmy Darnell which includes the moment Baker has left his bike and is about to cross the Elm Street extension. In the background, racing up the extension towards the railroad yard, is officer Smith:

At this point, Smith has already had his interaction with Gloria and is heading up the extension. If it can be established how many seconds after the shooting this moment is, it can be established how quickly Gloria got back to the steps. This is important because by the time this still is taken, Gloria has already had her interaction with Shelley as stated in his affidavit.
When Marrion Baker arrives at the TSBD and is making his way towards the building:
Mr. Baker.
Except there was a woman standing--well, all these people were running, and there was a woman screaming, "Oh, they have shot that man, they have shot that man."Surely the "woman standing" who is screaming about someone being shot is Gloria.