To go along with the initial purpose of the thread;
If I were in the UEF's shoes at the end of the latest War in Heaven installment, I would likely replace Byrne and fold third fleets assets into second fleet while making Calder subordinate to Netreba. The Martian and Jovian fleets had been doing an admirable job in my opinion however the Jovian fleet was well slaughtered by the end of the latest installment and the benefits of operating independently would likely be limited. Byrne's definition of a 'defensive posture' seemed to amount to effectively ignoring all calls for reinforcement outside of the orbit of the moon until the last second, which so far as I can tell led to a lot of avoidable territorial/space asset losses. At that point the policy would just be hold out until the secret project finally comes out of the oven.
If I were in the GTVA's shoes I would find a way to dump as many fleet assets into the Solar theater as possible to get the war over with already. Sure it would be 'risky' since they would probably run out of supplies eventually due to the Sol gates limited capacity (IIRC anyhow) however at that point they could simply directly attack everything at once and end the war fairly promptly. The UEF would simply be saturated with full scale attacks on all of their fleet assets since so many of their ships had already been destroyed. If the UEF managed to survive somehow then so much of their fleet would be annihilated that the depleted GTVA reinforcement ships could simply stroll out of the system at a leisurely pace while Steele's assets covered their withdrawal.
Thats what I'd do anyways. Obviously this could be completely infeasible since I don't have access to all of the relevant information regarding the capabilities of the Sol gate, the GTVA fleet, the UEF fleet, its project, or political opposition to sending several additional GTVA destroyer groups on a little outing.
edited for clarity