The RN stands in opposition to what actually happened to JBR. The RN was placed on a traffic path separating the basement from the bedrooms. This gives the RN the appearance of a block or diversionary tactic. IOW there was never a kidnapping for ransom. The single intruder with a premeditated plan that involved the basement is going to have perceived threats beforehand. One of those threats is going to be a parent entering the basement unannounced. Another of those threats is going to be the parents calling the police while the intruder is still in the neighborhood. IMO the ransom note was never used for its intended purpose, since the parents never came downstairs until morning. Even then, the ransom note effectively delayed a house search for hours. The parents called 911 and reported a kidnapping. During the morning hours, the police were looking for a girl matching JBR's description. Without the note, the police would have been looking for a murder suspect. SIDI makes more sense than RDI because in RDI you have to believe that the parents called 911 hours earlier than prescribed by the ransom note they themselves wrote. You also have to believe that they invited local LE and FBI to a scene where they willingly left handwriting and capital murder evidence lying around.