But I think Gray has some good points about the possibility of an uprising in the GTVA.
Aye, Kursk as a turning point was only a good analogy up to a point because Kursk solidified the Russians gaining the upper hand militarily. Ignoring the secret project (which itself is not entirely militaristic according to our information so far), a UEF military victory in Steele's final attack has to be big enough to cause a political victory within the GTA - force them to reconsider because the population won't support the war or even actively revolts against the leadership. In terms of simple numbers and units, the UEF is still going to be outmatched even if they do pull off a military victory.
There doesn't seem to be any reason why any of them would treat humanity as anything other than pawns on a board of bone (had to throw that in there)
From my understanding, you humans can live with being pawns if the game makes sense.

The E
I would agree in the short term but mid/long term?
If the battle of Earth is lost then its game over both sides know this - will Steele know when to withdraw if he is losing? Will this even be a possability?
If (and it is a big IF) The UEF can inflict heavy enough casualties on the GTVA forces whilst preserving enough of their own strength then what is to stop them from rebuilding? Is there a shortage of resources in Sol that so far has not been talked about or some other reason that their greater manufacturing ability will not be able to allow them to catch up?
I would actually look at it the other way - the Japanese navy was stronger at the start of the conflict but the USA was able to replace losses and exploit R&D breakthroughs in order build an advantage over time. A position that I feel would be comperable to the UEF - IF they manage to defeat Steele's assault
P.S sorry for hijacking the thread
I also apologize.

Arguing which analogy is best is always tough because as much as things fit, too many others generally don't.

The US Navy in the beginning was actually just as powerful than their Japanese counterparts, the Americans just didn't understand how to use what they had as effectively. The Japanese also had the initiative, but were unable to translate that into total victory and were unable to harm US infrastructure. Eventually, as you say, the US rebuilt stronger and better and after that it was only a matter of time. The Allied tanks and equipment were better than their German counterpart's in the very beginning of the war, but the Germans knew how to use what they had so much more effectively.
In contrast, the UEF are just completely outmatched. I think they do tore down the myth of Steele somewhat, but the GTA have many more destroyers, fighters, and battlegroups, overall better tech, etc ..., have well trained, determined soldiers, and even their worst commanders don't appear to be stupid. As you said, the view of the battlegroups arrayed at Jupiter is quite the sight ... and that's still not even close to what the GTA could bring to bear if they really, really wanted to ... (and could afford to politically)
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Of course another thing to keep in mind is that the UEF and GTA are not each other's true enemies - extinction is. At the moment each side believes the other is a threat to the extinction of the human race. If the true enemy of extinction does rear its head, that will necessitate a change in the dynamics beyond a UEF or GTA victory.