So I played a match where we had a Xayah (equipped with the Cosmic Dusk Skin) who had a Leona as a support. I know that Skins are considered AU (Non-canon), but would Leona be considered a traitor to the Solari for helping someone tied to the Moon? Would Diana try to befriend Cosmic Dusk Xayah? How well would the Solari react if Cosmic Dawn Rakan appeared?
Ultimately I think the lore is leading up to the Solari and the Lunari aka Leona and Diana, rectifying the problems between the tribes/religions. Based on the new Nami lore, we saw that even Solari priests are capable of a change of heart. The Solari would probably freak out if they met Cosmic dawn Rakan, I see the Solari as really uptight people.
A bit unrelated, but tip for those who's Rakan is taken/banned while with a Xayah with the cosmic skin-
Play Taric. You're nowhere near as mobile, but the W that allows you to be in lots of places at once is a good approximation, and the theme and the shades of blue really go together.
