The RN was corrected from a "delivery" to a "pick-up". From this shouldn't we assume that the intent was to show that JB's body had made it out of the house, and was coming back again - as long as the ransom demand was satisfied? Of course, we know she'd come back dead, since the police were called. But somehow John would have to get out of the house to deliver the ransom money, which was to be exhausting, after he rested. If the 911 call was deliberate to provide a reason for JB to be gotten back dead, then the R's also knew they would be under surveillance from that time forward.
Here's the glitch: Since the ransom call did not come on the 26th, that moved the incoming call to the 27th - which would also be in keeping with John having time to "be rested" before having to make the delivery. Police still around - perhaps Patsy sent out of the house along with kids arriving from Minneapolis. If RN was bogus, and no real kidnappers, who was going to call JR on the 27th to set the wheels in motion to deliver the ransom? The phones were trapped and tapped. Could Patsy have made the incoming ransom call from a cell phone and not been caught? Or was there another accomplice off somewhere to make the call so JR could leave to deliver the ransom money, thereby getting a call from the kidnappers that JB was stashed in the WC after all? There was supposed to be a pick-up, not a drop off of her dead body, and if they couldn't have gotten her out of the house because of police surveillance for that pick-up, a call that she was stashed was their only option.
If they planned on waiting until the 27th for that to happen, then they didn't realize there would be smell to deal with, and JR must have panicked when he went down to the basement during his "missing time", checked on JB and discovered she was smelling. No wonder he was so nervous. What a relief when Arndt gave him the option of "finding" her.
It would all be much more easily explained if we went with the thought that the RN was meant to scare Patsy to death from calling the police. That would give JR the space and time to take care of everything, since it would be easy to send off Patsy and Burke, then circumvent the older kids' flight and get them sequestered with Patsy. Then he could get called "early" (after it had gotten dark on the 26th) since he could have made arrangements for the money early that day. Of course, he would tell Westmoreland why he needed his Visa line opened up, swearing him to secrecy - which would give the "kidnappers" a reason to kill JB. JB's body would go along with the trip to "deliver" the ransom money (which would never really get delivered), being disposed of along the way. And at the right time, JR would call with the devastating news that he delivered the money, was instructed by the kidnappers (or found a note at the money drop site) as to where to pick up JB, and now the police could be called to pick her up, but they would, instead, find her dead - maybe even with a new note that said, "We warned you not to talk to anyone."