I, for one, would be very interested to read the several explanations for why an intruder would take the time to sexually assault her, bash her skull in, strangle her some time later, write a ransom note and place it on the stairs, clean up her body and change her clothes, but then decide to just leave the body and the ransom note in the same house. That should be interesting reading.
Let's theorize why the intruder was there in the first place. If they came to kidnap JB, then they'd have brought the note with them, and when they decided to move, snatch her up, drop the note on the way out and be gone with her in 2-3 minutes, tops. We know that didn't happen. If they came to molest her, and something went wrong and she was killed, then why was the ransom note even written? At the point that the intruder has a dead child on their hands, they bail, either with or without the dead body. They don't sit down and try to make up a lie, clean up the body, change her clothes, et cetera. If they came to murder JBR, once she's dead, objective complete. Again, you don't need a silly ransom note. What you need is to get out of the house ASAP to make sure you're not caught. We all go into self-preservation mode, it's a natural reaction. Self-preservation mode for an intruder is to get as far away from that house as possible, as quickly as possible. That's not an option for someone who lived in the house. For a resident of the home, self-preservation mode is create an explanation for why she's no longer alive and well and with you on the morning of the 26th. That's exactly what happened.
There's a very simple explanation for why there was both a body and ransom note in the home in an RDI scenario. JR was showering, cleaning all the evidence off himself from cleaning up JBR's body when PR deviated from the plan, which was to call police after JR had taken the body out of the house to dump it, and go to the bank and withdraw the ransom money. Call police and all your friends after John had left, so as to explain why the ransom call never came, and why JB would be found dead. The RN explicitly told the Rs several times if they talked to anyone, JBR would be killed. We know that JBR had already been killed, and so did Patsy, which is why she made no mention on the 911 call that the RN said the family and the house was being monitored....because, you know, a parent who received a note like this and actually believed it, would have taken every threat very seriously and made sure they weren't doing anything that would directly lead to their child's death. We can all understand making the call to LE...but calling over a houseful of friends as well? For what purpose exactly, moral support at the risk of your child's life?
Back to the theory...why would PR deviate from the plan? Simple explanation there also, she couldn't stand the thought of JBR's body being dumped like a sack of garbage. It might not be found quickly enough and might decompose. Then she wouldn't be able to put JB on display for her final and ultimate pageant.
See, RDI actually explains pretty much everything. The "adequate size attache"...why would any intruder care what size case you pick up the money in? The note instructed JR how the money was to be paid out, in what bills. It would require 38 stacks of bills wrapped 50 bills in each stack. That could easily fit into one of Burke's shoe boxes, so why would JR need an "adequate size attache"? In a scenario where R wrote the RN, there's an easy explanation for why the author would specifically mention the size of the case, so in case anyone sees JR carrying the suitcase he had JBR's body inside as he was taking it to dump, the explanation would be it was for the ransom money. Fibers from inside JAR's suitcase were found on JBR, supporting the theory that her body may have been placed, or tried to have been placed inside it.
This theory also explains why JR and PR were so estranged the morning of the 26th. JR had to be pissed at PR for deviating from the plan. He knew the body would be found in the house, and reasonably deduced one or more of his family members would be charged in her murder, including himself. Was his wife trying to set him up to take the fall? That had to have crossed his mind...but he had to be careful not to let on that he knew anything and he couldn't ask his wife "wtf?!?" with so many people there at the house, so the easiest thing to do was just avoid her.