I look at it from the other angle, that the culprit was successful in the staging, no one can ascertain what the crime scene is to describe, was it all in the pool room, did anything take place in any other room of the house, or were those other items found on the floor planted red herrings- at least no one that has shared with the public and IMO, therefore, it is more difficult to assume this is a specific person. All these years later and we still are asking what the scene was telling, why were they located in the positions and area they were in. Was it all for staging, was it all done at the time of the murders, did they come back to readjust the bodies (after visiting other rooms in the house, not necessarily on another day), we do not know.