We don't know that Jade has a wealthier husband. We know Steven works as a school administrator. We know Bella's husband left her a huge home she didn't pay for on a non-tenured professor's salary. We can probably assume Jade and Steven together earn more than Bella does alone. That seems logical. We can also assume that the school counselor who is running around doing threesomes is more likely to have enemies than the prude librarian or the shy junior math professor.
We also don't know that Jade has a higher position in the college. They are both professors. Neither has been labeled as a department chair or anything that would give one seniority over the other, and even if one had been they are in different departments. A gender studies chair has no pull over a math professor.
Context matters, so here's mine. I now something about being a junior professor. I was one. I know something about being a tenured professor. I am one. I know something about being a school administrator. I am one. And I know something about being a girl. I am one. I will tell you from personal experience that setting up a to girl one guy threesome is not difficult, especially if the girl is bisexual or bi-curious. Setting one up with two guys is harder.
As for having nothing to threaten Jade ... her and Steven aren't getting along and you know he has incriminating photos of Jade and other faculty or students in compromising positions. You can probably assume she has the same type of photos of Steven. It's unlikely they would throw each other under a bus professionally. But you can be damn sure someone there would throw Jade under a bus. Isabella did not appreciate being involved in that threesome and she seems to blame Jade more than she does Steven. She told the MC she doesn't like Jade. She told the MC she does like Cathy.
It's entirely possible that Bacchus is correct in that I'm making too much of this but the photo of Cathy is from the sauna and so it would be impossible for no one to know who took it. The options as to who took it are limited.