True to an extent. She is different from the rest of the house, but still beneath her father and also her mother. Her mother can also be shared already. Shani is not on her own. Has not built her own dynasty yet. So, she is not above her father and being used as he pleases.
Also, Shani will likely be more likely to participate on her own (based on player choice). She is the second protagonist, after all. And we've seen a very mild choice as such while she was in the zone. No reason to think that won't continue and get more extreme. As you said, she's in a different position and with that, could make her own choices.
Maybe your Interpretation just differs. Shani is badass, but kinky. The scenes with the queen show that.
In my eyes, they are alike to a degree. Both have power. But they enjoy to let go from time to time. And don't forget: Shani already started sharing. Her dad with the queen. And with Ain and her Mom. She definitely seems into that. So why suddenly stop there?
So, I have to disagree with you, friend. Seems to me YOU are wrong about Shani.
The sharing scenes we have so far are based on Zaton's dominance over the girls he may share.
Basically he tells Ain to do it, even though she doesn't really want to, but Ain isn't in a position to protest.
With Shani, Zaton is shown to be very careful with her sexuality, which is the reason why they only had sex after her training was completed and she was ready for her first solo mission. And that was instigated by Shani, Zaton was kind of reluctant about it.
So any sharing that might happen with Shani will not be like "you go and do this to him" (like it is with Emilia, Ain and to a certain point Zahra) but it will be more driven by Shani herself. At that point I wonder if it can still be considered "sharing" because Shani isn't really Zaton's to share. As
GetOutOfMyLab said, she didn't start her own dynasty yet so she might still be considered lower in Zetan hierarchy than Zaton, but she still should have a choice with whom she wants to have sex. As such, I disagree with him about Shani "being used as he pleases".
Also, I do think we need to realise that sex for an important woman is different than for an important man. After all, the woman may end up pregnant and if she is powerful that means that will have consequences for the dynasty. Lesbian sex is obviously different in that respect. Shani getting pregnant by some random guy just so she (and certain players) can have fun doesn't make any sense. What is interesting and perhaps telling is that we had the discussion with Ain about getting married and moving out, but we didn't have such a discussion with Shani yet.
Perhaps Shani is not yet deemed ready to start her own dynasty, perhaps Zaton intends to keep her for himself for now, perhaps the goal is to set Shani up with the Queen, either as royal "husband" or as a kind of concubine. In ancient Egypt, female rulers were generally depicted as male kings, including fake beard. Perhaps here it is exactly the other way around, with the ruler being Queen and her "husband" as consort, complete with fake beard, if necessary.