I'm curious as well where the DD delivery was actually made, and have seen some discussion of it that makes sense to me that she would probably have been asked to deliver to the front door right where she was parked, and would not make her way around the side of the house and up the incline to drop off by the slider (unless that was a common delivery practice for Xana and the DD driver that was in place).
If the DD delivery was indeed made to the front door, with Xana coming down one set of stairs from her bedroom to the front/ground floor front door to get it, I've always wondered whether BF who lived on that floor would have heard them (or she was asleep then), and if awake and heard them could confirm that she heard Xana and the DD driver making the hand off at the front door and Xana going back upstairs with her food.
And if so, if that helped LE verify when & where the DD delivery occurred & proof of life for Xana at that moment.
Also, IIRC, there were statements in MSM in the first few days (that may have been removed or just been unverified rumours) from people who said they walked by the front of the house after sunrise later that morning, and maybe also the people who came later in the morning and discovered the crimes, that the front door was wide open.
I've always wondered about that aspect of the front door being left open, because it was pretty cold that night and doesn't seem like it would have been intentional by people living in the house or Xana/the DD driver in terms of heat loss & security when it was the middle of the night in November and everyone in their beds and sleeping or close to sleeping.
So it makes me wonder if BK purposely opened it after the DD driver left and Xana went back upstairs with her food, before he went around to break & enter through the slider and commit the murders.
Or if he knocked or banged on the door and BF was awake & opened it thinking it was someone who they knew and was locked out (and didn't see anyone).
Or if Xana went back down to answer and saw him and was not sure who he was or if he was friend or foe, and then that is when one of them said "There's someone here".
Or if it could have been one of the housemates thinking Kaylee's ex bf Jack was there (after she & Maddie supposedly called in the hour before & may have wanted him to come over to the house) and needed to be let in? and then that is when one of them said "There's someone here".
What if BK did try to interact with any of the housemates he could rouse at the front door just after the DD driver left and he pulled back in just checking the situation, or to gain entry to the house, and when one of them opened the door they left it open for a visitor they thought might be coming around to the doors (and would check the slider next) and he was the one who went around to the slider next?
I'm not sure if it's of much significance or whether it will come out at trial, but have always wondered if he:
- First tried entering through the front door, and if it was left unlocked (for someone the housemate's thought might be coming to see one of them), just threw it open to create a distraction while he went around to the slider, or
- Knocked on the front door & he heard someone coming to answer & that was too much attention with one or more housemates still being awake & answering the door, so he stepped away before they opened it, and then went around to the slider.
JMM (just my musings), it's always been a niggling thought for me about what may have happened at the front door, right in front of where the DD driver parked and said they saw him parked there when they arrived, and why it was left standing open in the cold in the middle of the night if that is accurate from early on in MSM that people said they walked by and saw it was open.