The Flame of desire doesn't add up

The Forgotten god creating the seven daemons from his flame of desire. Is no different than the other six gods creating life from their flame of desire.

It was said that the daemons dying is doomed to have them reabsorbed back by the Forgotten god and completing him.

So why not the same is applied to other six gods? Wouldn't it mean that with all the deaths caused by the Doom war, that the state of the six gods of being weak would be reversed because they would be reabsorbing the flame of desire that they used before to create life?

And even if we argue that all that flame of desire would have been funneled towards the shadow god, wouldn't that mean that the shadow god strength had been growing ever since the dawn of creation?