Why? There are many gods that were dreamed up that were not the greatest entity possible, many had glaring personality flaws (Jealousy for one). I don't think that it is necessary that if there was a god, it is the greatest entity that could exist. If you do consider this something that is required of a god, I think it could boil down to an argument of semantics and calling the god a creator.
Kinda reminds me of a reversed kalam cosmological argument. Also, the word inconceivable being used so many times makes me think of the princess bride.





