A way to fit Aurelion Sol into the Star Guardian universe
Disclaimer: this doesn't have to end up with a related skin (but it'd be cool if).
From what we know from the latest SG stories, the First Star "split" itself and its power in order to create the Star Guardians and have them fight the monsters all around the universe.
But then, what if a part of its consciousness and power remained in a dormant or a ghost-like state which then reacquired selfawareness in the form of our Star Dragon?
We don't know also what's the fate of the dead SGs, do they pass their powers to new ones? Are they "claimed back" in a way that could allow SG Aurelion Sol to get more of the First Star former power back to him? This could give a nice plot twist and darkening even more the fate of the SGs while also giving Ahri a reason to rebell against this destiny.
Aurelion loves his creations. He would never willingly destroy something he has created.