One thing I don't think has ever really been touched on is the existence and nature of the alternate universe the 14th visited in BP1. The Vishnans were very keen on not seeing the last bastion of humanity - the Sanctuary - annihilated, despite the fact that the human race still exists in 'our' universe. Why was it so important to get those last humans home safely? Why did the Shivans want them destroyed? Is the existence of Ubuntu somehow relevant for the Vishnans? I wonder what the real difference between the two universes is, asides from the absence of Terrans and Vasudans. The alternate universe never had ETAK, no deliberate communication from humans to Shivans. That stands out to me.
I don't think the Vishnans cared for the Sanctuary one bit, or they'd have helped them before. I think the Vishnans wanted to make sure the 14th got back to their own reality, but changed in a way that screwed over the initial invasion. Since they let the Sancutary tag along, I highly doubt the Vishnans given reason of restoring the balance between the universes (for that the 14th would have had to return without the Sanctuary).
I also think the Vishnans are responsible for the Sanctuary being found by the Shivans:
First the 14th corsses to the other universe, then the Duke goes nuts and in their madness goes directly toward the Sanctuary. Then the Duke breaks down exactly where and when a scout wing of the big S happens to patrol the area. And just a moment before the GTVAs emisaries arrive at the Sanctuary, she happens to be discovered and attacked by the Shivans, enabling said emisaries to save the Sanctuary just in time.
That must have been the miltiverses biggest chain of extremely unlikely coincidences ever, or someone or something orchestrated the whole thing.
After that the Vishnans seem to sink into the background again, untill the moment where secret manipulations don't cut it anymore and they are finally forced to openly show their hand in order to save their unknowing pawns from the Shivans.
While I was always sceptical about the Vishnans, I never actually disliked them... untill I fnished the above piece of text...