For the most part, I agree. But there are a few parts of the last update that with certain choices gave the impression to me that might be shifting (such as Els saying that Vi looked tasty enough she could have taken a bite herself and parts of her response if/when MC tells her he slept with Vi when taking a 'slow' approach to sex). Both of those are paths that give some of the first 'elspethinterestingirl' points too.
Either way, if there is such a path, it'd be pretty early in development. But since we're only about halfway through the AVN, there's still plenty of time for things to shift.
Edit: It's also just a little bit of process of elimination for me. Amrit-Ines seems the most likely to me for reasons people have already discussed. Vi-Ines appears at first glance to be likely, but I also agree that it's more likely for them to just stay close friends. Personally, I see Kana as even less likely to share than Els, and while Kana-Amrit could have maybe been a thing or be a casual threesome, I don't see Kana being interested in poly at all. She's talked more than anyone else about potential committed monogamy. So that really only leaves Els-Vi as cases where I've seen any recent hints or points in that direction.
A quick comment on this, but by far the largest theme of Unbroken is dealing with trauma. I get the sense that a significant part of Els story will be about how trying to live up to the expectations of her legacy by joining the military was a traumatic experience for her, and that to find happiness she may need to learn to live for herself a little rather than just meet the expectations pushed on her by her family legacy and society. It's partially because of this that I can see her opening up more to less traditional circumstances than would be expected of an heiress.