The following is MOO:
I keep hearing about a potential robbery but I haven’t seen anything except (questionable) reporting by MSM to support that. Am I missing something? Here’s an alternate theory: KB was taken someplace else (kidnapped) and killed. Nothing was visually out of place in her home. LE could have extracted wallboard or carpet, etc. with questionable stains or whatever for testing that was negative. But it’s possible that the search that resulted in LE believing she was no longer alive is related to other evidence entirely. Maybe they found a diary entry or something on her computer that showed she feared for her life. Or a letter pointing to PF if she ever went missing. Since there is no body (yet), and they appear to have evidence of solicitation, I think they are covering all bases until the investigation and analysis reveals more.
Again, this is just MOO...