It wasn't the Ramseys. Whether it was JMK or some other, well...
Why do you say that? You seem very certain.
The biggest problem I see with the timeline has to do with the pineapple. Even allowing for wide variances with known cases for her weight, the room temp, etc. the latest she could have died was 11 p.m. That's from a convergence of TWO well studied forensic pieces of evidence. Now, add the pineapple. She needed at least 1 hour to get that down to it's observed transit point. But that means an intruder had to feed her pineapple no later than 10 p.m. But that's when they were walking in the door. Unless someone can explain that to me, I can't see how an intruder did this.