andreww,
BBM: If you propose a RDI theory then the RN can represent staged forensic evidence, intended to point away from the R's and explain why JonBenet was moved from her bed down to the basement.
Similary in an IDI theory the RN can represent real forensic evidence implicating an intruder. Absence of a RN would have left the R's having to explain why JonBenet was found wrapped in a blanket inside the wine-cellar, with no obvious signs of entrance or exit for an intruder!
Make that TWO people who have it right!