what’s the deal with Milchick?

I can’t wrap my head around him. the Kier obsession at Lumon is incredibly bizarre, but I understand why all the innies believe it, because it’s all they’ve ever known. Helena also believes it because she grew up with it. I’ve seen lots of theories about Cobel and why she’s obsessed with the Eagans, so I think it’s something in that respect with her. but Milchick? if he’s not severed, how did they ever convince him to want to work on the severed floor? (minor, S2E1–>) >! Be the BOSS of the severed floor??? !< how did they convince a grown man with a normal life who randomly got a job at a corporation to worship a dead corporate leader? (S2E3–>) >! i think he’s truly convinced because of the scene with Natalie and the paintings. !< that paired with hardly ever seeing Milchick leave the building, I’m convinced it’s a more massive conspiracy than anyone expects, like he’s a reborn human invented by Lumon or something. idk, thoughts?