I agree with you with on all of your points especially -
While I believe this was over custody, I also believe the R’s had some serious dirt on the Wags that would not only prevent custody of S going to JW, but would also destroy the Wags as whole.
There had to be something very important in it for all involved, including John Doe.
We really don't know why the surveillance started or even who exactly they were eavesdropping on. Don't know if the audio or video was more important to them. At a minimum, they must have heard a lot of trash talk which would have fueled the issue.
And you're so right, this is probably where the "bizarre" part of the motive comes in. There had to have been something very illegal/immoral going on...
We don't know and the R's can't talk because they were murdered. I am going to wait til I see the trial evidence before I decide if anything very immoral was occurring.
SW was born in 2014 and I guess it's possible if you are a controlling person or family that SW might be the reason. JMO.