Provavelmente não
Um 2016 Vanity Fair article discute a gênese da história de Rogue One , e lança sérias dúvidas sobre essa teoria:
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John Knoll, o Industrial Light & O executivo da Magic que primeiro lançou a história que se tornaria Rogue One , surgiu com a idéia da história durante a produção de Revenge of the Sith , quando a série abortada de ação ao vivo Guerra nas Estrelas: Submundo ainda estava na mesa:
It was around that time, while in Sydney working on what everybody believed would be the final film in the franchise, Episode III: Revenge of the Sith, that Knoll first heard that story development had begun on a Star Wars live-action television series.
"I thought, Oh, that's an interesting idea. I started thinking about what might be fun stories to tell in the Star Wars universe that might make a good one-hour episode."
One of Knoll's immediate thoughts was related to the opening crawl of A New Hope—the screen-filling, scene-setting prologue text that rolled diagonally upward into the cosmos at the start of the film.
...Rebel spaceships, striking from a hidden base, have won their first victory against the evil Galactic Empire. During the battle, Rebel spies managed to steal secret plans to the Empire’s ultimate weapon, the DEATH STAR....
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Knoll tinha em mente o caráter de Jyn Erso desde o começo (ênfase minha):
"I have three daughters who grew up while I was working on the special editions and the prequels," he says. "They got to be big Star Wars fans. And, you know, I would see them identifying with a lot of the male characters and I just thought: Star Wars could use more good strong female leads. I wrote Jyn in as the protagonist from the very beginning. It felt right for the story."
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Como Pablo Hidalgo confirmou no Twitter logo após a publicação deste artigo, o nome "Jyn Erso" também veio da Knoll :
@Burzol Pablo, but that name, Jyn Erso, also came from John Knoll?
@pablohidalgo Yep.
Em uma entrevista de 2017 com o Yahoo! Filmes, Knoll discute de onde veio o nome "Jyn Erso"; aparentemente seu primeiro nome veio de várias senhoras de sua família:
When it came to naming her, Knoll didn’t have to look far for inspiration. "My youngest daughter is Jane, and my wife is Jen, so [Jyn] is sort of mashup of them. And growing up my aunt was Aunt Ginny, [short] for Virginia, so there's a little bit of that, too. It’s a mix up of a lot of my favorite women in my life."
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Como diz o artigo, e como Hidalgo confirma no anterior do Twitter nesse tópico ao qual me vinculei anteriormente, Knoll didn não sabe sobre as Forças das Trevas quando ele escreveu o tratamento; ele aprendeu sobre isso com Hidalgo depois de lançar o conceito como um longa-metragem em 2013:
Knoll reached out to Lucasfilm's Story Group, the anointed story-development executives who manage and defend the Star Wars canon. Story Group executive Pablo Hidalgo — a founding member of the Star Wars Fanboy Association who now worked for Lucasfilm — informed Knoll that, actually, the theft of the Death Star plans had been covered a couple of times already: a 1981 NPR radio drama and a 1995 first-person shooter computer game, Star Wars: Dark Forces.
Tendo em conta todas estas coisas, parece excepcionalmente improvável que Jyn tenha sido modelada em Katarn ou Jan Ors.