Why does Solus just happen to look like the Ascian who is posessing him?

[Theodric]

Emet mentions he could do that himself in his debut scene when talking about the cloning vats. He also mentions early in Shadowbringers (I think in his first scene with the Scions) that he possessed and altered someone on the First. (Weird how we never inquire about the person he just erased, that seems like someone should care.

A lot like the numerous little girls that perished at Hydaelyn's and Minfilia's behest on the First, then. Speaking of which, it always struck me as a strange writing direction that little girls were specifically sought out and possessed as hosts instead of grown adults.