I agree. And unfortunately we will have a while to wait before SD lets us know whether Brett is a bad badboy or just a bad goodboy. I think SD has kind of a "pash" for him herself - judging by how she writes him - quite delectable!
For what it's worth, my guess is Sam told Christopher about the tape, since he's the face of Vidal Records management and Vidal is sponsoring the music video. Deanna would have interviewed Chris Jr and they both would have picked up on each others' animosity towards Gideon. When CV heard about the tape he old have known how it would bother Gideon, so he contacted Deanna and told her about it. Then she could publicize it without Gideon knowing Christopher's part in it. Christopher is afraid of Gideon - with good reason.