BWF "In the shadows", that's what you like?
"I was back in the shadows[with her]" but it's only his head that's in the shadows, so that could apply to the person to his left in Darnell(or Shelley in Wiegman).
He still thinks that's the only reason he cannot be seen in Altgens.
In that same interview he goes down to the first step, then he hears the hollering woman, then he's back up on the landing when he turns to Sarah. In one interview he talks to her but in this one he does not, they just look at each other and "didn't have anything to say"(do you like that part or not?). Why does he mentally picture himself "down on the first step" when he hears her? Perhaps because on the landing he could not!
In one interview he turns to Sarah to say "how pretty Jackie looked", in another, he just thinks it to himself. How does one choose which is correct? I think you've made yourself clear on this already, "whatever best suits my purposes". Perhaps he was in a world of his own during the Darnell timeframe and I refuse to boost the value of witnesses to support or debunk some damned theory...
Finding "Calvery" in Darnell is a superb find, the same woman seen lining up on Elm in Zapruder, I get it, after what you wrote I looked into it, it's great, two women ran directly for the TSBD and got there before Baker reacted. The movements in Darnell and Couch are a wee bit clearer now but you take it way too far. What it does not do is let us see inside Frazier's mind and it certainly does not tell us that these women were still screaming when Couch and Darnell reacted to Baker.
Roy Truly may have also reacted to the women, that's what he was walking back there for, that he never mentioned or recalled it for us exactly, doesn't rule it out.
Everything we see in Darnell and Couch around the TSBD may be related and caused by these women(I said maybe, baby), the way people are moving, not to the noises they all seemed to have ignored but y these hyserical woman but at some point they had to have stopped screaming.