Interesting theory but the SW part is not an issue. All it means is fox can use the character, has no impact on the marvel version other then she can't be called "mutant". So that's really no impact.
It definitely has an impact. I did not say they're legally barred or anything, but it seems clear that she is left off of a lot of the official marketing or promo art that's been release thus far for the film. The exact same thing happened with Age of Ultron. She and Quicksilver were completely left off of most of promotional and marketing art for the film, even when they were featured prominently in the theatrical posters and trailers.
The exact same thing is happening now. She's featured in the official concept art and the trailers, but on all the marketing and merchandising promo images, she's replaced with Sharon Carter.
Outside of the films she's also confirmed to not be appearing in the TV show and she's also the only hero from Civil War not being included in the Disney Infinity game.
It seems like someone on a corporate level is not happy with the idea of Marvel heavily promoting a character whose film rights are not owned lock stock and barrel.
And they always do this stuff, with not revealing things. I don't know what her role is but there's 2 hours of movie she could be in and the trailers don't reflect. There's no zemo, no crossbones, no spider-man no Ross...reading to much into the trailer is not the best way to figure out what's not in the trailer and why. Lol
Ross was in the trailer. And hey I could be wrong, but I'm calling it like I see it. If Sharon seriously had a big role, I don't think she'd be getting treated like an afterthought. She's certainly not a character who'd need to be hidden or treated like a surprise.