Thanks, SWM, for that bunch of RFC snips. It's great to have no-Gbaba-exploration authoritatively confirmed - hopefully that puts a stake through the heart of that notion. I was surprised it wasn't emissions that did it for revealing humanity's presence: I knew being lost in the background was an issue but had no way to figure out how far out it'd take to conceal them conclusively, and didn't really take seriously any competing notion of the source of contact.
That bit about humanity coming across multiple civilizations the Gbaba... Gbaba'ed was a surprise. One would not have expected many to pop up in an area in a "short" period of time on the scale of the evolution of intelligent life in a small part of the galaxy. I have to wonder: has the whole rest of the galaxy been Gbaba'ed, do they have neighbors with which they (have to?) practice co-existence elsewhere, are they still fighting or searching for other civilizations they've met, or is this small area of the galaxy special somehow with intelligent life popping up in it far more frequently than elsewhere? (To be promptly Gbaba'ed, in an obscene whack-a-mole game.)
None of those four seem independently plausible, but it's hard to see an alternative if there have been that many civilizations struck down by the Gbaba near Earth, caught between the time where they would leave enough for archaeologists to find (Iron Age at the earliest, I'd guess, for archaeologists without vast amounts of time to go looking, and given Gbaba destructiveness, and able to beat the Gbaba at the latest - a mere 3-5,000 years or so).
Anyway, to specifics:
SWM wrote:I do agree that humanity can defeat the Gbaba if given enough time to prepare and good enough technology. But I think you should take another look at the 43 years of the war before drawing conclusions from it.
In one of the posts I found in my search (I can pull it out if you want), David noted that for the first 20 years of the war, many people on Earth (but not everyone) could convince themselves that they could defeat the Gbaba. That suggests that, in reality, the Federation was trouble right from the beginning, though they did have some early successes.
For the first 20 years or so, the Federation was only fighting the local forces which happened to be ready. Then much bigger forces started arriving. For the last ten years or so (if I recall correctly), Earth was essentially under siege.
20 years to fully mobilize and get on the scene... One horrific possibility is that those were ready forces that took 20 years to
travel, given stupendous distances covered by the Gbaba. That may mean that most of the galaxy IS Gbaba space. Still, if that's the case, finding a region for Safehold to be safe may have taken more luck than can be counted on. More likely - certainly more hopefully - the delay represents mainly reactivating reserve units and/or new builds, and raising and training crews for them (or whatever Gbaba equivalent applies, if "raising" or "training" aren't quite apt). For that matter, they may even have had to build the yards to build the ships, if it took that long.
Earth, of course, was by far the best defended and best supplied human planet. But I suspect the Gbaba were not trying that hard to invade Earth for most of that time. When the attacked Crestwell, they used an enormous force--I don't have the book handy, but it was something ridiculous like 100 to 1 force ratio. I think the Gbaba strongly prefer huge force ratios like that. So the reason the Earth lasted for 10 years could be because they were waiting to gather sufficient force to apply 100 to 1 odds before attacking Earth.
And if could be that they took awhile after discovery to mount the attack on Crestwell, even when it and the first few attacks thereafter were essentially recon in force missions by Gbaba standards.
That could be taken as evidence that it took 10 years for some ships to arrive at Earth. Or more if they started the gathering earlier in the war. Which could mean a large (but not necessarily galactic) empire.
It could also mean that the Gbaba don't value time the way we do, following Napoleon (at least). They're content to take their time to do things in massive numbers, to surround the target thoroughly to prevent escapes, and grind it down through attrition with those massive numbers. If they are not normally inclined to chase things down, going far out of their way to avoid
having to do so makes sense. If they had to choose between an intense, 5 year hot war followed by 100-200 years of bughunting, or a 40 year war that was slow but utterly decisive, they may plausibly prefer the latter. It's probably not what we would choose, but we're not Gbaba.