Blatant disagree with T-V numbers. Operation Thresher yielded 500 pilot casualties at the beginning of FS1, WAY more than a few dozen ships. And remember, the GTA still has other fleets, and traditionally, the GTA/GTVA never engages more than 2-3 fleets in a specific conflict, for all we know there could've been a load of ships waiting in other systems as part of other fleets which would've formed the reserve. In FS2 the GTVA had dozens of fleets, yet only the 3rd and 4th Terran Fleets were deployed against the NTF and the Nebula and the 13th Vasudan Battle Group, the local forces, yet the GTVA held back the rest of their fleets, that's my evidence for you.
As referring to the fleets engaged with the Shivans in the GW, I'd probably agree with you, but fighters man, waaaaaaay more. Did you see the CBanim at the beginning of FS2, look at all the squadrons based on the Bastion in the Great War, that surpasses your few dozen fighters already. Post-Reconstruction you've done a better job IMO, sounds realistic, the combined power of three fleets/battlegroups.