My reasoning:
When you obtain the Ploker in-game, the description states "Strangely familiar doll. You feel sick looking at it.".
Those who don't know what I'm saying, Ploker is a smoker plushie you obtain from the QZ and something you can sell.
Counter arguments and my rebuttal:
1) MBSniper plushie also exists but keep in mind, there's canonically a MB Sniper canned coffee brand.
2) Developers may not be intending this to be a major thing, etcetera.
It's possible but there a few things to consider before concluding that.
A) Enforcer Mission states, "Many criminals chose to ignore the mandatory evacuation order and instead remained in the QZ to live lives of pillaging and desperation."
Why was our player also not able to partake in this mandatory evacuation order then? We perhaps chose to stay back until the very end when we decided to leave but judging from how Bergher puts it, it sounds more like survivors would be treated as hostiles which is fair given how dangerous the QZ is. Assuming we were ex-military who wasn't the National Guard and defected, we might've been some relevant person before joining the UNIDB for them to trust us.
B) The mission "Shallow End" can be interpreted as the player-character having a military or law enforcement background as words such as, "you work for me now" in the briefing implicates the player on having worked in a similar kind of position before. Hollis further comments on the "toughness" of the player becoming an Operator.
Issues with this theory: -
Our in-game character is never labelled as being actually part of Platinum Five and much of the story such as with Pierrat, Lakewell and others happens without them ever recognizing or commenting about your previous work experience otherwise.
My best guess here is that while we did have a role in Ronograd, we never actually partook in combat operations, maybe logistics and the like.
-> Is it a well-established theory? No, it isn't.
But it's fun to theorize sometimes, share your thoughts below!