Father of Chaos

There's q good (though short) detail of the way overgods work in faiths and avatars, the gods supplement for the forgotten ralms. At the beginning of the book they explain how the number of gods in a specific world is regulated by it's overpower.
The forgotten realms novels are the best source of understanding what is Ao, still. To summarize, he can do pretty much everything and anything in his crystal sphere, has no existence out of it, and has for role to maintain the balance between the gods. He actually has no interest whatsoever in mortals, and his worship is plain useless. In his role of maintaining balance in the realms, he refers to a "being of light" who oversees all the overpowers. No more information in stock about that over-overpower (it's getting a little too much for me anyways..)
What I'm asking myself is: how could have the Krynnish gods have been created by an overpower, since the main twos (Paladine and Thakhisis) are just pseudonymes for Bahamut and Tiamat, children of Io, the dragon at the origin of everything, first before creation?

But anyways, this all is of such little importance in terms of gaming that I wonder why they even bothered creating it. Players should hardly ever interfere with powers, and overpowers are absolutely not concerced by mortals, except to rise them up at the status of greater power all at once, which certainly isn't of any concern to the players. Actually, overpowers don't even manifest only Ao ever did, and only once. So I'm really wondering what's the point...