This is precisely the illusion caused by primacy effect!
Both Aiwass and Princess knew the real name of Blood Celestial Marshal was Cain, and that he is the son of the Banquet Master and Sasha, and in actuality, even more so the son of the Banquet Master and Eternal Self... Thus, they subconsciously felt there might be some issue in logic or details here.
The Banquet Master himself is a Dragon.
And the growth rate of Dragons is particularly slow... Helquinn's son is a testament to that.
Cain's posture when he ascended to godhood is still that of a "youth," how could he grow so fast in the Material Realm!
——But looking at Cain being the center of attention, even highlighted by numerous spotlights, nobody thought he could be fake! Coupled with Sister Sasha's personal recognition... From the beginning, Aiwass never considered this "Cain" to be an impostor!