Although the words of the Grey Celestial Marshal seem both true and false, Aiwass has roughly guessed his meaning—
The Grey Celestial Marshal does not have explicit hostility towards him. However, perhaps he is a bit restless, perhaps he is unwilling to leave just like this, or perhaps he wishes to accomplish some great deed, a task that requires him not to commit suicide.
Thus he purposely waited for Aiwass to emerge from the Abyss Egg, to once again acquire a material body.
Strictly speaking, this headless giant body about ten meters tall still isn't Aiwass's true form...
Aiwass only utilized the Sin Beast's authority to manipulate the Sin Thorn, simulating a temporarily usable head for himself. Inside the deer head helmet, countless Sin Thorns are densely packed, almost compressed.
Yet this body, in terms of strength alone, far surpasses his own physical form in utility.
