Where would we be without "experts?"
I don't disagree with anything said by this anonymous "expert." (It's weird that the video doesn't introduce him to establish his credentials but I assume he is a prof at WSU or U of I--I don't know.)
However, I am left with the same conclusion that I had one day, three days and five days after the murder, i.e.
we got nothin'.
It still seems possible that the killer was
known to one or more of the victims
or that the killer was
unknown to the victims. Based on what we actually
know, either scenario still seems conceivable and reasonable. My mind goes back and forth between the two scenarios, depending on whether the latest news or official update seems to reinforce one theory or the other.
But even if we could know for sure whether the killer was known or unknown to the victims, investigators still seem to have little else to go on. Maybe they are making great progress and keeping it a secret, but I am more mystified by this case than when I first read about it six days ago.