This is basically just about the circumstances of his existence again, this time less about his literal birth and more about how he's maladapted. War trauma, autism, he was born a teenager and grew up quickly for a nation, to humans he acts like an old man but looks young, he's emotionally disconnected but not detached enough to not care, he doesn't understand other people and other people either don't understand him or understand so well that they're threats, he holds on to army habits and routines and rules that mostly just inhibit his attempts at change, and he does that for comfort as much as he does that to keep functioning. The progress he makes as an individual is so incremental that it might as well be like the world is passing him by while he tries to fix the unfixable; maybe he needs to unravel at some point, but then who's gonna do his job?
Anyways. Put him in a trench, knock him over the head thrice, send him to work as a farmhand and that's an AU for you. The birth defect the calf is pictured with is called schistosoma reflexum; it's a real thing I can subject him to.