PMPT, Inside The JB murder investigation, and Kolar's book. All of these books hint the inclusion of one person. It's like Patsy's claims that the guest bedroom was never used--no one goes in there, really. Then what's all this stuff on the bed? Lyn Wood told Alex Hunter during a deposition that he better not be looking there. I viewed that as a treat and I won't take it any further than that.
I still view the RN of having a moment that revealed what was really happening. There were little unnecessary pieces of detail that were coded to a single person--the one who the RN was really meant for.
Get this, anyone who's on the phone with 911 won't hang-up the call. Everyone believes it was Patsy who hung up the phone. I believe it was John--he needed to put on his clothes before the police arrived. He then went upstarts to get dressed when Patsy realized she didn't want to be in the house alone with him. Yes, she made the calls for help when John was out of the room.
[If you don't believe that to be true, then John hung around while she made those calls to her friends for help while John was standing next to her. When she finished the calls, John went upstairs to get dressed--possible but not likely. That phone is the key to the outside world. You've got the police coming to the house, but if she had her friends here, John would be less likely to take this to the next level.]