You keep forgetting that Karen Westbrook:
- was there
- was good friends with Gloria Calvery and saw her every day
- also identified herself from the front in Willis 5 (or as you call it "Willis 3")
On the other hand, your only source regarding the identification of Gloria Calvery in Zapruder is:
Yeah, Karen Westbrook really "nailed it," didn't she?
Uhh ... to smiling and nodding (and prompting?) STEPHEN Fagin, while looking at "herself" from behind in the Zapruder frame and while "she" was wearing a hair-hiding headscarf and a figure-hiding raincoat, some fifty-four years after-the-fact.
Oh yeah, and from the minuscule
Willis-5 Willis-3 images of, in reality, blue-headscarf-wearing Sharron Simmons, strawberry blondish-haired Gloria Holt, and self-described American Indian, Stella Mae Jacob.
In that equally great identification of herself in
Willis-5 Willis-3, she was obviously confusing the
very light blue headscarf she wore that day with Sharron Simmons' light blue one.
D'oh
-- MWT

PS Westbrook remembered her old buddy Gloria Calvery so incredibly well that she referred to her as "Gloria Calvert" (sic) at least once in that interview, IIRC.