The Master mostly had to be added because of the addition of Edicts, which were a player idea (and an awesome one). Who gives edicts to the creator? Has to be someone higher up. And actually that made for a more interesting story anyhow. You're upper-middle management, heh.
I like the idea of being a middle-management diety (of all the universes, I get the one with the quibbling minor gods and the filthy humans).
Here's an alternative if you like: you're still top dog, but you're dying. You're wearing out. You've made and run the universe, and your will is draining, there's just nothing left. You don't have much time, so this is your final shot at a legacy, a self-sustaining seed of life that may someday populate the stars or whatever.
This explains why you'd have very little problem pitting humanity against each other in endless war; you have no choice since there will be no stabilizing force after you're gone.
How does it explain the edicts? Well, your mind is slipping, fracturing. You no longer have complete control over your own will. In fact, you suspect that some of these gods have split off from you yourself and are battering at the gates of your consciousness... etc.
So maybe that's a bit bleak, just spitballin'.
