With the highlighted dismal analogy failure, you have succeeded in inadvertently pointing out the difference between the sharpshooter fallacy and Jabba's reasoning.
There was no near-1 probability of Jabba's specific brain existing. The probability was near zero, because you all agree that Jabba did not have the option of choosing which brain he would be, either before or after.
You all agree that there was 1 and only one possible Jabba-brain, never was any other possible Jabba-brain, never will be any other possible Jabba-brain. That brain got 1 shot only: One very specific organization, one very specific place, one very specific time, or nothingness forever. It doesn't get any more starkly selective than that, from Jabba's conditional perspective.
So you're all contradicting yourselves every time you invoke the Texas Sharpshooter Fallacy. That ain't what this is. This is conditional probability.
One more time: you all agree that there was no group of possible Jabba-brains, summing to 1.