Let me re-emphasize this:
I don't necessarily think they were out to fool the police or the FBI. Because they don't have to fool the police. They don't have to fool the FBI. They don't have to fool pathologists. They don't have to fool SuperDave.
They have to fool one person out of twelve. THAT'S IT. As PT Barnum is supposed to have said, "there's a sucker born every minute." And, sadly, a LOT of those suckers find their way onto juries and give us OJ Simpson "justice." And they knew that. They watched the Simpson trial. There's your how-to manual right there.
I follow you. BUT, and this is crucial as I've often said, without the "kidnapping rant" as you call it, there's no explanation for WHY JB was killed and WHO did it. Without it, all you have is a dead girl in her own house with sexual injuries. Ask Ron Walker sometime who LE would have looked at first. The RN gives the Rs any number of wildcard explanations AND the ability to claim victimhood. "Why are you cops bothering us. THIS person said they did it. Why aren't you looking for them?"
Does anyone think this might have been the idea?