Hope no one minds, but just to throw yet another trail of thought into the mix- I was listening to Episode 40 of Jim Clemente and Laura Richards' interviews on Real Crime on Sound Cloud, the episode covering the autopsy report... They, too, were hypothesising about the possible sequence of events that night. They said they couldn't know for sure what happened, either, but Jim C mentioned something interesting...
He basically said that they couldn't be sure if or what happened fully or partially in the basement. He also thought that JB was partially strangled initially, for example by someone twisting her collar... (If I remember correctly, this would be before the head blow or final strangulation).He then said, for all anyone knows, JB could have struggled and broken free at that point, and run and hidden somewhere in the house. He said that Burke may have spent some time searching for her, during the long time lapse.
This caught my attention, as in that hypothetical scenario, surely Jim C is theorising about a possible attempt to hunt JB out, rather than a one-off head blow done in momentary rage. This confused me, as I was pretty sure Jim C had always called Burke's actions an accident? Just yet more confusion!
Sorry my details on this are a bit vague, and I'm rubbish at posting links. But, type in Jim Clemente Laura Richards sound cloud, and it should come up. Just another hypothetical possibility about how it might have all played out that night to wonder about, to add to Kolar and all the others. Sorry, not meaning to jump in the middle of the discussion!