Checking the uptie story, and the voicelines, it makes me wonder, does Hermann have something akin to Faust's integrated multi world knowledge network thing? Or some way to manipulate it.
For one, Yi sang is purposely given an EGO suit that fucks with his memories and his morals, that does not fit with his personality, and the subjects of their search which would put clarity on what their end goal is for Limbus' side are omitted too.

So what if it's not just Hermann purposely making Yi sang a compliant ally killer to keep him leashed, even going as far as not letting him partake on the EGO research, but also a way to censor anything that others might figure out by searching through mirror worlds? Implying there's a joint effort, or that Hermann found a way to manipulate things in other worlds?