Thinking about it again he should notice it.
He presumes that Azul race were Asuras because Celestial exists there.
But thinking about it now, in Azief journey with Will, they heard about Celestials and Celestial soldiers but not True Celestials.
True Celestials died out long time ago, and their legacy floated along the Universe and could be found in some broken stars, secret dimensional rifts or abandoned planets.
And Azief heard Azul said that he lives for eons before he reincarnated himself. Then how long has he exists?
Thinking about it again, what kind of eternal existence that could live for eons?
Everything that lives will one day in one form or the other. Some fades, some forgotten and some die by having their soul depleted.
No matter how immortal one might be, things that exist will one day cease to exist. Since there is a beginning, there will be an end.
Since there is life, there is death.
