That's a very good point and one that has given me pause about this scenario. However, my thoughts on this are that LE may not have any video evidence to go by, and/or is expecting to discover a body at some point.
OR that conflicting stories are being related by people inside the group (i.e., the POIs such as JR, DR, CR) and people outside the group, leading to a we said/they said situation with no detectable physical evidence. I'm not sure.
It is my understanding that LE acknowledges that the witness sighting of a man, darker skinned, with side burns, (resembling one of the POIs) with a girl, resembling LS, over his shoulder and basically incoherent. Now, LE states that the witness' timing is different than what they believe. This must be because of video evidence they have. They DO NOT discount this sighting, only the time. It was posted earlier in these threads that the direction of this man/girl was not toward her apt and in a direction where cameras would be minimal at best.
All of this makes me believe that while this theory of her ODing and passing out on the couch, then someone getting rid of the body, takes into account a POI that isn't mentioned here but should be as his description matches the witness' rather well. Then I wonder if LE even did a line up for this witness? That would be rather easy while everyone is in town. Or, perhaps she identified him through pictures and they are keeping mum on this.
This witness account has always puzzled me as to the weight LE has given it as well as discounted it. They claim her time was off. OK, if that's all, is her account of this scene spot on? She must be on video somewhere along her route as well. This would make the last sighting of LS later than what LE reveals, because of this witness sighting. Am I right? Are they just not disclosing? Are they just not revealing their belief on whether this was a sound sighting in the hopes that the person who allegedly had LS thrown over his shoulder might come forward and say, hey, yeah, that's me. That would be a start to answer the question - WELL WHERE DID YOU BRING HER?
At first, I was on the fence, seriously about this witness because it seemed LE discounted it from the get go as unverified. Then they go a little further and say we're not saying that didn't happen, just that it didn't happen at that time.
I'm starting to question the intelligence of the BPD.
I think this is the person they are seriously looking at, in addition to his "friends" and others he was connected to.
Or, this never happened and this girl is just making this whole thing up.
I doubt the latter.