Certainly possible. But I imagine the Ancient's war as a multi-sided affair with constantly fluid alliances and continual potrayals. I extrapolate this from my assumption that Grandfather's children and children were all very much like him, meaning that it probably took the short-term survivors a very long time to take to heart that Grandfather meant to exterminate the lot of them. I can easily see more than one assuming that they were special enough that Grandfather wasn't *really* going to kill *them* along with everyone else. That's why I refer to "all sides." At one time or another, different factions killed off one another, in the mistaken belief that helping out Grandfather in this way would earn them some sort of truce.

 

When I was engaged in running the Mongoose version of "Secret Of The Ancients," I was prepared to explain this by having the folded space forming the boundaries of the pocket set to redirect internal incoming radiation into the form of fake starlight. Having very little math, I can't speak to how much energy it would take to pretend to be all of the visible stars in a normal night sky. But if were not enough or too much, the imbalance would be rectified by adding or subtracting from the energy budget used to maintain the folded space (into which said imbalance would doubtlessly disappear like the proverbial raindrop in an ocean).