Gorgeous series! Thanks a lot.
Wrathion is perhaps the worst candidate for being the black aspect. Wrathion caused both Warlords and Legion so TWO massive world ending threats which is the opposite of what the "protector" aspect should do. Ebyssian hid with the highmountain for years and only advised them so again a bad protector. Sebellian is the ONLY choice here and after the Shadowlands and Slyvanas lore fiasco I hope blizzard doesn't make more lore mistakes.