Do the Rs even have an IDI scenario? How did the perp enter and leave? Where was JB killed? Why the two means of lethality separated by an hour? What is their explanation about the pineapple? When was the RN written? Who knew about the 118K bonus? How did PR's hair wind up in the ligature? Why was JB redressed and why was that done so poorly? Who had been sexually abusing JB and why was the family ignorant about this? These unanswered Qs could fill pages. No. The Rs do not have a credible scenario.
Something that is ridic about all this is that, during his 'reenactment', LS climbed down through the basement window in the daylight, not in the dark. Also, there was no evidence of melted snow anywhere, which there would have been if the intruder came in that way during the night. Of course, LS didn't climb back up to leave via the window. The grate was in its proper place when LE first arrived, which would mean that the intruder placed it back in position before vanishing.
They have explanations for those things. I don't know of any reason why an intruder couldn't just walk out the door near that grate.
The crazy part is the second floor hemp rope business. Iirc, Lou Smit said the intruder brought it in to facilitate his escape. To rappel from the 2nd floor?
The Ramseys both said the rope might belong to JAR so it doesn't actually need an explanation. And it's a dead ringer for a rope JonBenet used in a photoshoot years earlier. When confronted with photographic evidence, Smit doubled down and said the rope in evidence didn't hold its shape as well as the one in the photoshoot. So the intruder, according to Smit, brought in a rope of the same material, handedness, length and with the ends taped exactly the same way, just a little limper. That should have narrowed down the viable suspects, huh?
One might expect the natural fibers of a rope to degrade a bit over the years. It seems that Smit could not admit a mistake.