Highjohn wrote:Variation on evil AI overlord.
GOOD AI UNDERLINGS!!!!
The Gbaba are AI. This means artificial intelligences. They did not evolve or if they did they were repurposed possibly with some modifications and reprogramming. There is after all no reason a sufficiently advanced alien group couldn't use biological AI. However the 'alien group' which created the Gbaba are dead. There could be many reasons for this, but the important point is the Gbaba were their soldiers. However to protect themselves from the Gbaba the alien made them unable to create or use new technologies. So the Gbaba are 'lobotomized' and they aren't going to innovate. They got all their technology from someone else and were ordered to protect an area of space. Then they never received any new orders. So now they are like the remains of the Empire from the Dahak series. Which had some old ships with active(but senile) AI still running them and which would have fired on Dahak but had no ammo. This could be the same thing. I would also explain why they do not
expand.
I particularly like this hypothesis because it is mine. However, I also like it because it actually makes the Gbaba the good guys. They are good AI attempting the faithfully carry the defense of their creators. They just got put in an unexpected situation and are now doing the wrong thing by 'instinct'.
Note:
This entire thread should be titled Spoilers for other David Weber books.
I think you may be onto something there.
A variation of this idea is that the Gbabba aren't a civilization at all.
Instead they are the automated defenses left behind by a civilization - a civilization which has vanished.
Kind of like a mine-field that stays on long after the war it has been emplaced for has fizzled out.
The defenses have a capability to rebuild themselves to the specified levels but no more than that.