I think that was a poster's speculation, not from the media and not from tight-lipped LE.
I don't remember a case where there were so many LE returns to various places. KB's townhome had at least 3 searches: cursory community caretaker search 12/3?, extensive SW for her home and vehicles, then the Thurs 12/20 additional overnight search.
If this goes to trial, LE will have to lay out all these complex steps of investigation and evidence. I do wonder why if the townhome is now described as the scene of a "violent crime" when did they know that, how did they figure that out, and why wasn't it noticed earlier - or did they know all along but they only told the public she was missing, cold rolls, and so on, so that the suspect would not know what LE knew.