Friendly with the local barman
One bit in the memory of Voldemort's job interview that has always bothered me is Dumbledore's statement that he knows which Death Eaters are waiting at the Hog's Head because he's friendly with the local barman. Voldemort has just returned to Britain, no doubt planning terrible things...and Dumbledore immediately outs his brother as a spy? WTF? And then Voldemort continues to let his followers gather in the spy's pub?
I'm sure you could make a good story out of a Cold War-esque game where Voldemort is sending his followers in with false information to mislead Dumbledore while Dumbledore tries to filter out the misinformation to get at the real information they inadvertently reveal, and they both know the other knows... But it seems odd for Dumbledore to choose that option instead of trying to maintain his spy's cover first.
There's another possibility: maybe Aberforth wasn't the barman yet. Maybe the proprietor at the time was a Voldemort sympathizer, or at least a potential one, and Dumbledore wanted to oust them so he could put his own agent in place. Either he tricked or coerced them into telling him about the Death Eaters, or they wasn't involved and it was Willy Widdershins or his predecessor hiding under a veil who really reported to Dumbledore.
Voldemort shouldn't be so easy to manipulate that he immediately believed the proprietor was Dumbledore's agent. But the suspicion might have grown over time, no doubt nurtured by other "clues" Dumbledore helpfully planted, until Voldemort decided it was time the proprietor found a new job. (Possibly that job was "inferius.")
And he should have been deeply suspicious when Aberforth Dumbledore took over the pub, no matter how public the brothers' estrangement was. Aberforth couldn't just indignantly protest his hatred of Albus and all his works and give the Death Eaters a load of intelligence to prove his loyalties--that would be too much, too soon. But letting a few things slip over time, and griping about his brother just often enough to sound natural (well, it was--he just secretly hated Voldemort even more), and Dumbledore deliberately not acting on information Voldemort deliberately leaked via Hog's Head patrons to make it look like he never got the intel, might eventually convince them that he was on their side, not his brother's. Or at least that he was genuinely neutral.
A third possibility is that Aberforth was already the barman, but not yet Dumbledore's spy--again, it would really have been Willy Widdershins reporting on the gathering. Instead, this was Dumbledore's overly-complicated scheme to force Aberforth into becoming his spy. ("If I get Voldemort to suspect him, the means Voldemort will use to try to get the truth will convince Aberforth that Voldemort is dangerous and must be opposed. He's smart enough to realize that the best way to do this is to convince Voldemort that he doesn't trust me or report to me, then turn around and report to me. I'm a genius!") But that's even more convoluted and risky than most of Dumbledore's usual plans. I think it works more smoothly if Aberforth wasn't the barman yet, and this was Step 1 in Operation: Trench Coat Goat.
No wonder Aberforth is so cynical about how many people his brother is willing to sacrifice.
I'm sure you could make a good story out of a Cold War-esque game where Voldemort is sending his followers in with false information to mislead Dumbledore while Dumbledore tries to filter out the misinformation to get at the real information they inadvertently reveal, and they both know the other knows... But it seems odd for Dumbledore to choose that option instead of trying to maintain his spy's cover first.
There's another possibility: maybe Aberforth wasn't the barman yet. Maybe the proprietor at the time was a Voldemort sympathizer, or at least a potential one, and Dumbledore wanted to oust them so he could put his own agent in place. Either he tricked or coerced them into telling him about the Death Eaters, or they wasn't involved and it was Willy Widdershins or his predecessor hiding under a veil who really reported to Dumbledore.
Voldemort shouldn't be so easy to manipulate that he immediately believed the proprietor was Dumbledore's agent. But the suspicion might have grown over time, no doubt nurtured by other "clues" Dumbledore helpfully planted, until Voldemort decided it was time the proprietor found a new job. (Possibly that job was "inferius.")
And he should have been deeply suspicious when Aberforth Dumbledore took over the pub, no matter how public the brothers' estrangement was. Aberforth couldn't just indignantly protest his hatred of Albus and all his works and give the Death Eaters a load of intelligence to prove his loyalties--that would be too much, too soon. But letting a few things slip over time, and griping about his brother just often enough to sound natural (well, it was--he just secretly hated Voldemort even more), and Dumbledore deliberately not acting on information Voldemort deliberately leaked via Hog's Head patrons to make it look like he never got the intel, might eventually convince them that he was on their side, not his brother's. Or at least that he was genuinely neutral.
A third possibility is that Aberforth was already the barman, but not yet Dumbledore's spy--again, it would really have been Willy Widdershins reporting on the gathering. Instead, this was Dumbledore's overly-complicated scheme to force Aberforth into becoming his spy. ("If I get Voldemort to suspect him, the means Voldemort will use to try to get the truth will convince Aberforth that Voldemort is dangerous and must be opposed. He's smart enough to realize that the best way to do this is to convince Voldemort that he doesn't trust me or report to me, then turn around and report to me. I'm a genius!") But that's even more convoluted and risky than most of Dumbledore's usual plans. I think it works more smoothly if Aberforth wasn't the barman yet, and this was Step 1 in Operation: Trench Coat Goat.
No wonder Aberforth is so cynical about how many people his brother is willing to sacrifice.