That’s definitely one of Mars’ weak points. There have been many times where he could add a sentence or two and completely remove any ambiguity regarding a particular subject and it wouldn’t adversely affect the flow of the writing, but for whatever reason he just didn’t. Then he’ll address it after the fact and it makes you wonder if he even remembered about it at all until it was time to reintroduce it. Case in point: Evil God Seeds. Goddamn, but I have complained about those fucking things.
All I can say about Devil Che is, he isn’t Chu Feng. And Mars’ style is to save and keep safe the MC’s harem. Maybe keeping her effectively enslaved, even if not literally, and used as a tool is enough of a humiliation in his eyes. Who knows, I don’t. I never liked her, but I never particularly hated her, not to the point where I’ll be upset if she doesn’t get tortured, at least.