It is Barney, just before he had an unfortunate accident considering a pool of liquid coming out a garbage disposal tank near the canteen.
He had to get a really expensive face replacement, that’s why he still owes Gordon a beer as the operation cost Barney all of his money.
Well, I did not expect that. Bravo sir.
Real explanation, they made it as close to Barney as they could without making a custom model that nobody would notice without noclip.
Where’s the source for the Barney’s backstory?
It’s Barney’s twin brother with a mustache, Arnie Calhoun. One time, he shaved his mustache and Gordon gave $20 to the wrong Calhoun for beer payments, and now Arnie is $20 richer. Goddamn you, Arnie.
Something something vague canon, something something impossible to tell during normal gameplay, something something who even cares
Yeah someone on reddit explained it to me, my bad.