If Capitano becomes playable so will pierro and sandrone (Spoilers)

I have this theory that all characters from Khaenri'ah or descendants of Khaenri'ah are playable (minus ones with npc models like caribert)

Let's start with the current playable ones ingame:

Kaeya is a descendant of the Alberich family. Arlecchino is a descendant of the crimson moon. Albedo's 'mother' is Rhinedottir who is one of the 5 sinners

Now let's get on with the current non playable ones that have been ingame Dainsleif (while is mostly likely confirmed playable) is known very well in Khaenri'ah when mentioned by capitano. Capitano is currently leaked to be the next playable harbinger as columbina doesn't have any leaks so far (yet so don't bash me in the future if she comes out). He isn't dead however and has been shown animations just recently, therefore he is very likely to be the next playable fatui harbinger.

Now notice the pattern so far? If capitano will return than that means it is likely we will get pierro (and maybe sandrone as well), as pierro was a royale mage of Khaenri'ah and has the similar star eyes of kaeya with so much lore to be uncovered and we will probably see him in our journey to Khaenri'ah along with dain and capitano. Now as for sandrone (note this is a theory) I've mentioned her because of the giant robot she has which looks more like a ruin guard than the clockwork meka enemies from Fontaine. And keep in mind as stated by Scaramouche, she is often focused on her research and hasn't appeared in Fontaine with arlecchino, therefore I believe sandrone may appear in snezhnaya and will have lore associated with Khaenri'ah.