The question of what each Ramsey knew and when they knew it is a fascinating one. I've always believed Burke was sent up to bed that night not knowing he'd killed JonBenet. In his head, the kidnapping was an entirely separate event and he was never told anything about the cover-up.
As for John, there is some compelling evidence that perhaps he woke up entirely unaware of what had transpired the night before and then figured some version of it out as the morning unfolded. This doesn't quite explain why he closed ranks so quickly. John would have no way of knowing what the DNA and handwriting tests would reveal. For all he knew, Patsy or Burke's DNA could have been all over JonBenet. I would say the odds of him being in on the cover-up from the start are higher than the alternative.
If we agree that Patsy wrote the note, it's clear she was involved in the cover-up from an early stage. What I'd like to know is if the Ramseys were aware of JonBenet's head injury. It's possible they might have thought she had broken her neck. Additionally, it's fairly clear they didn't know about the pineapple or they'd have incorporated it into their version of events.
As for John, there is some compelling evidence that perhaps he woke up entirely unaware of what had transpired the night before and then figured some version of it out as the morning unfolded. This doesn't quite explain why he closed ranks so quickly. John would have no way of knowing what the DNA and handwriting tests would reveal. For all he knew, Patsy or Burke's DNA could have been all over JonBenet. I would say the odds of him being in on the cover-up from the start are higher than the alternative.
If we agree that Patsy wrote the note, it's clear she was involved in the cover-up from an early stage. What I'd like to know is if the Ramseys were aware of JonBenet's head injury. It's possible they might have thought she had broken her neck. Additionally, it's fairly clear they didn't know about the pineapple or they'd have incorporated it into their version of events.