You mean if Miru and William meet each other while he was in prison ? I think this still is the case. I also think that Leia will come to accept whoever William - the player- come to choose. And no manner how much I want, I still cant see Leia + Miru, hope me proven wrong though.While I agree that Leia would target anyone endangering her relationship with Willi, we already saw in chapter 2 with the martial arts fight that Miru gained a bit of respect from Leia. And if Miru and Willi came together roughly in the same way or style as in old Wiab, Miru and Leia can become really close.
As for Ayua, for quite some time Ayua in SG is rendered clearly towards Leia in style, dress, makeup. Just a few examples with Leia to compare.
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I doubt this choice would be made without Leia being a part of Ayua´s life. This would also mean Willi, Miru and Leia having found some togetherness which functions. As for some of her cousins being her halfsiblings, I think Ocean would circumscribe it, hint at it in SG to leave himself some wriggle room, but going by what we know about the characters this would happen.
About Ayuvya. I can see the similarities, I just don't think that it necessarily means Miru + Leia. Leia could come to accept Miru but this does not mean sharing with Miru, or she does accepts only Ayua as she is part of William but does not Miru, there is more than one way to explain Leia influences on Ayua.
You Are right, Ocean could maintain the vagueness. Is just that after a certain point is tiresome, a definition to a story is good, even if it is one that I don't like