Right, I don't want to use my own opinion, but...
How does the GTVA like their threat exigency stuff, used against real Shivans? Did the end result of the threat exigency thingy work as expected? Was there room for improvement? Did it fail horribly?
The GTVA's pre-Sol invasion doctrine was never engineered for fighting the UEF in mind. So...I don't want to factor them in, because they're unrelated.
Well, the TEI ships laid a severe beatdown on most standard Shivan forces in AoA. They still were heavily outmatched by superdestroyers and juggernauts, however. Something tells me that a defensive operation, a la Capella in FS2, would be far more succesful with the new ships. Shock jumping Chimeras and Bellaphorons, subspace missile strikes, precision jumping, better and faster fighters, even more destroyers with HUGE hangar bays (the Titan), more powerful beams, ship-ship missiles, expanded logistics capabilities with the GTL Anemoi, and who even KNOWS what came of any recovered ETAK data, as far as potentially disrupting Shivan communications and jamming their weapons is concerned. Also, I am sure plenty more was learned about subspace travel via the whole rebuilding-a-knossos operation, so the GTVA could very well have extremely advanced subspace tracking, able to detect Shivan ships way before they even appear. And who even knows what the Vasudans have come up with militarily...
The possibilities are endless, really.