The time line of the wounds inflicted on JonBenet has been established on the basis of medical evidence; it is independent of the Ramseys' version of events; crucial elements of the forensic evidence flat-out contradict the version which the Ramseys offered to the police.In my theory, I don't want to make the assumption that the lethal head blow came after the R's returned from the Whites party. I don't want to make any assumptions about what happened before and I sure don't want to accept the R's word about what happened before.
The pineapple evidence in the victim's small intestine for example exposes the Ramseys' statement that JonBenet had been awake when they got home as a a flat-out lie.
Pineapple digests very fast, especially when eaten without other food.
The head injury was inflicted first (see J. Kolar's book (p. 64), where he refers to the medical evidence which led the experts LE consulted on the case to conclude this): The quick digestion time of pineapple places the head injury about 30 minutes after JonBenet ate the fruit (corroborating evidence: fresh pineapple was also found in a bowl sitting on the table in the North dining room, next to the kitchen).
Here is a link to Forums for Justice where a poster ('learnin', who also posts here on WBS) who has worked as a medical imaging technologist for many years presents his extensive research about the digestion time of pineapple.
Link to the thread on Forums for Justice where poster koldkase has collected the medical imaging technologist's crucial info (starting from post #43):
http://www.forumsforjustice.org/forums/showthread.php?t=9490&page=4
Putting all this info together, it results in a timeline where JonBenet suffered the skull fracture not long after the family had arrived home.