To me, the key to this story is KR's vehicle. The fact that the car is missing narrows the set of reasonable explanations for her disappearance. (Yes, certainly, there is no evidence so anything COULD have happened and it could have been aliens or trafficking or 1000 other things, but I choose to focus on REASONABLE.)
There is a lot of speculation of the things that, again, COULD have been done with KR's car. IMO many of those possibilities reflect either 1) pre-meditation/planning, 2) very good luck. If she was taken advantage of because of her drunkenness, kidnapped, disposed of due to an OD, then there is no reason for her car to be missing. If her car was ditched randomly, say, in a parking lot, then I find it unlikely that it would remain undiscovered more than a week later, especially with all the attention that the case is getting.
I'm not drawing a conclusion, exactly, just arguing that the missing car weighs notable for and against different scenarios.
IMO