There is this idea that some big fight happened, and the entire house had to be in on it including the kids there for a sleepover. I don't think that at all. Maybe John and one or two people had a fight and one punch is thrown, and it rattles JOK. Maybe there are no punches thrown, but a verbal altercation happens and the dog jumps on him because when people are fighting or even wrestling around dogs can get protective. They tell him to get out and he does. He wanders out front looking for his ride because he thinks she's still going to be out there, and she isn't. He slips in the snow or sits down because his head is hurting, and he dies. I am not saying this is exactly what I think happened, but it is possible there was not much of a disturbance inside so not everyone was aware as it happened, and they might not know JOK was hurt as badly as he was when he left. That sure would be a reason to keep quiet once you realize that he's dead on the front lawn you know because nobody checked on him or thought to help him so fault just might be on the homeowner having the party.
We don't know because no LEO went inside to look or question anyone inside the house, no SW of the house was done, and lots of things were deleted or disposed of after that night.