I'm surprised I haven't seen anybody suggest Dani as the culprit. Ultra-crazy feminist, I doubt she'd permit him to have a lock code on his phone that she didn't know.
Dani's whole shtick is feminism, there is literally no reason for her to bodyshame a teacher. Plus the nails don't really match the person who is putting up fliers of Cathy naked.
But it doesn't explain how the video with Jade leaked. I assume that the video with Jade was deleted from the computer, but since all the brothers' phones are synchronized, one of the Diks could save it in the cloud.
All Hell Week the files are kept in their own folders, you can see them while exploring the computer in Ch6. You just can't access any but your own and Derek's.
Let's assume that Stephen really fucked 3 female students
And that fact that he admitted 3 to his wife, doesnt mean it was actually 3, bro rule suggests it was more like 6. He most likely fucked Quinn, Riona, Sarah, Melanie and Camila
It's pretty obvious it is Riona, Sarah, and Melanie. Camila hasn't been 'in the business' long enough at that point, and Sarah & Mel are flighty and trollish enough to spread that rumor. Quinn doesn't seem to actually fuck the clients herself, aside from when she was absolutely desperate to make money, her college fund likely comes from drugs or a deal to provide him with college girls that aren't her.