I live for Blight discussions spiraling out of control!
You just gave me this random idea of the Old Gods being the Creators sealed away by Fen'harel. They could barely access the Fade in their prisons, but they eventually found a way to the Void and took on the power of the Blight in an attempt to repair the 'sundered magic and power'.
Hrrm.
I like the old gods a lot so I'm okay with this too, lol. So long as they are more than what they appear. I'd hate for them to be such pushovers.
I bet we could get clues from the Cthulu mythos. Cthulu had a sort of calling himself that worked a lot like Corypheus', and the Reapers also obviously had the same thing, plus their stupid hivemind starchild idiot. Cthulu was the child of Nug (LOLOL) and Yeb, where most people assume he's just this all powerful being, but he's not even one of the strongest in the mythos. So if Bioware's following that pattern and they continue to make mass effect and dragon age similar, you can bet they're more than just the dragons that have been getting their asses handed to them by wardens and griffons for ages.
If the old gods have an entity in charge of them, it better be cooler than starchild. I'm still assuming that one with many forms in the elven ancient text is it.