But I am curious about YOUR IDEAS, there are many unofficial things around here(hundreds of ships, unofficial programs like PCS, ModelView etc.) Why cannot you tell your imaginations?
I think they were not so advanced, because they couldn't discover life nor on Earth, nor on Vasuda. Eight thousand years before the Great War, there were already life on Sol, I think it is the time of Homo Erectus. They could have used the materials of our home to strenghten their economy, and indrusty. They could have made it only if they had colonized our world, and this is a reason for the Shivans to come and kill.
Same in the case of Vasuda, in addition, it is quite close to Altair 4.
or
1. They expanded their civ eastwards to Altair(unexplored for the GTVA)
2. Shivans left the life on Earth and Vasuda intact, so they could seek after another challenge several thousand years after.(This is probably the least possible.)
3. Ancients had just begun expanding when the Shivans attacked.
Write something like this about your ideas.