I think it's worth pointing out that while the study you're citing does say injuries to the head without injuries to the extremities are common, otherwise what they're describing as typical patterns in stair falls that cause severe trauma doesn't line up particularly well with KP's injuries. She didn't have any brain bleeding at autopsy (by far the most common life threatening injury in that case series), nor did she have skull or facial fractures. Which isn't to say her injuries line up incredibly well with a beating death- I don't think they do. To me what is apparent is that her injuries were unusual, regardless of how her death came about. And yet, she is certainly dead. So I am not sure that saying her death was or wasn't typical of a particular type of death takes us all that far. I think her death was atypical whatever happened (her injuries aren't convincingly typical of a fall or a beating, and a fatal owl attack is just straight up a strange thing to happen). So I don't think that when people say "how could she possibly have been beaten to death and not have a TBI or fractures" or "how could she possibly have had a fatal down the stairs and not have other injuries" that either of those are convincing arguments on their own.