it occured to me that the knossos gate at dc was dated in excess of 10,000, so that was there 2000 years before the ancients were destroyed. so that gate network has got to be pretty vast.
taking the philisophical view, the shivans are the destroyers but they are also the preservers. creating nebulas is essentially a way to renew the universe. also stars are only capable of producing elements up to carbon, heavyer elements have to be "baked" in hot nebulas. so through the destruction of stars the shivans may bring new life to the universe.
the relationship between subspace and gravity is cannon, what do you suppose the effect of a ship in subspace during the nove would be? the sathani entered an intra system jump as the sun went nova, most would assume that this was to escape the blast, but to where. as far as they could get would be the edge of the system, but they would have to linger there for centurys before it could cool enough to navigate to the nodes out. perhaps the shivans have the ability to pull an inter system jump from anywhere in the system, but how do you get that many sathani in line for the jump in the few seconds before the wave hit? it would explain why a few remained. i have the feeling that subspace would expand during the nova, and the sathani were riding that expanding wave of subspace for reasons unknown.
the lucifer's mission was genocide , so thats why it attacked so visously. perhaps considering us the ancients' legacy. it is my belief that the increase in subspace usage caused by the t-v war is what awakened the shivans. the sathanas fleet's mission was to blow up capella, shivans made no attempt to enter gtva space. they focused their resources on covering the systems they were to do their dirty work in.