Don't forget John Ramsey originally told police that he read the kids a book that night (meaning both kids, as in JonBenet was awake to hear it) then went to bed, only to change his story later and say that he had been misunderstood and had meant that he had read a book and went to bed.
If JonBenet was awake, and JR originally said she was and then Burke, in a videotaped police interview, also said she was awake when they got home, then I think JonBenet was awake, and hungry enough to gulp pineapple down. The pineapple in her system had been poorly chewed, and they didn't find her prints on the bowl (what about the spoon, BC, you'd know), both of which indicate to me she was really hungry from playing at the party and needed a snack before bed.
What happened between JonBenet eating the pineapple and taking her last breath is anyone's guess, but the fact is she was awake at some point after the family returned home and ate a snack, and we know the pineapple in her intestine was consistent down to the rind with what was in the bowl, so that's where she got it. Why are the Rs denying any knowledge of anything to do with the pineapple? Obviously they forgot it would turn up in an autopsy and didn't have that worked into the story they decided to tell police - "she was asleep when we got home."