I have a feeling the husband will play a important role in upcoming releases where he will either confront the MC after he finds out about him and Nicole or he plays the villain. I really like the dynamic he has right now. He's got a very good plot potential.
Yeah, he is already the villain. Knowingly or not. MC has to expose him and his wrongdoings to free all the girls he abuses, which will also mean Nicole is free estate to us.
MC taking over the company, and giving the girls jobs + more safety, not having to whore themselves out should be pretty good deal for the girls to work for you after you take that asshole down. Of course, the reputation of the company would go down, but MC could make everything go well again. The power of plot armor.