FSFreak, I don't think the Shivans would scrap the Saths, they have a special purpose that we don't know about. I agree with Koopa, the 4 BFReds were either there to protect the Sath's subspace weapon, or were simply benefit of having the weapon's reactor. The Melchom and the Bane could actually be trying to escape Capella before it went nova. And about the Saths not jumping out. Perhaps they just had no more energy to do so after using the weapon. You actually see that the red fades from them, signalling they had used almost, or all, their energy on the subspace weapon.
The Sathanas fleet, at the time, could have easily wiped out the GTVA fleet in Capella, split up into two groups, wipe out Epsilon Pegasi and Vega, and move on until they have pushed the GTVA into a corner somewhere. They could've done that, the GTVA fleet was entirely inferior to a fleet of eighty Sathanes, but they did not. Wonder why...
So I doubt they would scrap Sathanes, I think they would simply just add more SAAA or protect them better with many more Cains, Liliths, Rakshasas, Molochs, Ravanas and Demons. Or simply keep them in subspace for as long as possible, stop at a rally point, recharge jump drives and continue on. So the Strategic Bombers would probably kill a few Sathanes before the Shivans begin to go all tactical on you. Perhaps if they still want to blow up ships normally with their Sathanas fleet, they would just jump them in and then warp them out as quickly as possible.
But the bomber strike force is probably the only thing the GTVA can rely on unless they make Meson Beams that can kill Saths in a single beam, which would be a lot cooler. However, flying a lumbering superbomer would probably be far more fun than just guarding the Meson lobber from Shivan Bombers.