Finally, an excuse! I've been thinking up a new Shivan theory, and this thread fits just right.
Why was there only one Lucifer? Because the Lucifer isn't a command ship or a warship or anything like that.
It's a flying bomb.
Yeah, odd thought, but here's the idea: The Lucifer, to our knowledge, only attacked the surface of ONE planet, Vasuda Prime, and we've always assumed, rather reasonably, that it was going to do the same to Earth. But what if that wasn't the goal, and more importantly, what if it wasn't the Shivans that did decide on the goal?
The Ancients were aggressive and genocidal, killing all that got in their way. The Shivans came in and wiped them out and then vanished. The Vasudans and Terrans appeared in the wake of the Ancients destruction, two races that had the Ancients continued, would have been destroyed pretty early on most likely.
The Great War saw the Lucifer comes in, destroys fleets and installations, but doesn't seem concenered with planets at all, until Vasuda Prime. Why would it go after Vasuda Prime? Because it was the Vasudan homeworld, but how could it have known that? Vasuda Prime is frequently described as mostly desert and with few resources. Aside from people, the planet really didn't seem to have much to offer the Vasudans. The Lucifer flattened it, while skipping perhaps half a dozen systems which, while probably not as populated as Vasuda Prime, certianly would have been of a higher strategic value. Why go after the homeworld? We'll get back to that in a moment.
Flash to the Bastion going to Altair. It appears the Lucifer was CHASING the Bastion, and was there when the transports headed off to recover the data but not AFTER the data was retrieved. Now the opposite chase is on as the Lucifer stays a step ahead of the Bastion to get to Earth. Wait, why? Why not just destroy the Bastion? The Lucifer is basically invincible to all GTA and PVN weaponry, so why not just slay the Bastion, and any other ship that could launch the attack on the Lucifer in subspace? It's not like Earth is going anywhere. And why did the Lucifer go ALONE? Sol is probably heavily populated, so why did it just throw a Demon at you as it was leaving when the Demon could have run point and cleared a path for the Lucifer?
Hell, more importantly, HOW did the Lucifer know to make a run on Earth? Or follow the Bastion?
The Shivans are a symptom of a "larger problem." They seem to exact "devine punishment." So, what if the Shivans are the tools of that "larger problem." The weapon of a self described "god." One that might just be able to see such things and direct the Shivans thusly. Maybe this explains how the Lucifer seemed to know to be in certian places, but it doesn't explain why it charged to Earth, if this "god" really wanted to destroy Earth, it should have easily been possible as long as the Lucifer went in under heavy escort.
What if destroying Earth was NEVER the goal of the Lucifer? Let us look at the final cutscene
again. Now, when did you destroy the last reactor? How many MINUTES before the Lucifer reaches the other side of the node were left when you destroyed the last reactor? Timing is everything here, because the Lucifer explodes JUST as it's coming out of the node, with enough force to destroy it.
That seems rather curious, doesn't it? If you take just enough time to do it, then yeah, that makes sense, but if you took LESS time? Then the Lucifer held itself together until it got to the node. I'm thinking it did it on purpose. The Lucifer is a bomb, and it's target was the node. The reactors may not have done a damn thing to the Lucifer.
Which brings us back to Vasuda Prime. Why destroy that? Well, look at what the Vasudans did after they lost their homeworld. They dissolved a corrupt government and restarted their economy. What of Sol? No idea, but all the people there are still alive, and the GTA outside of the Sol were forced to live without it and had done pretty damn well considering. And the Shivans just simply collapsed after the Lucifer was destroyed and were gone before the year was out. The Lucifer being the command ship might explain it, but I thinking that mission of the Shivans was complete, and the extras were simply abandoned.
This might explain many of the Shivan's actions in FS2. They were directed to not go beyond Capella after the Sathanas was destroyed, and instead were to send a message to the GTVA by blowing up a star. And it may also explain their reaction to ETAK, it might have been their command signal and it made the Shivans curious in a way they hadn't been before, perhaps it even overrode their normal imparatives for a time, which might explain why they promptly slaughtered the Icini's crew after Bosch left.
The Lucifer was a bomb, a giant suicide weapon. It was all part of a grand plan by our "larger problem," one that may have been also testing the Terrans and Vasudans to prove their worth in some way. And then it cut off Sol from the rest of them to pervent the infighting that led to the 14 Year War in the first place.
My thoughts anyway.