Jumping off your comment about the glass... We've been given very little specifics about MB's injuries. All we really know is "puncture wounds to the head and chest."
We know that there are glass tables in the general area where she was found. What if the puncture wounds came from her crashing into a glass table and shattering it?
I know a coroner would be able to tell the difference, but I'm not sure that the police would. Or possibly they held that info back as something only the killer would know.
No. LE made statement early on that puncture wounds consistant with tool the suspect was carrying. Please no offence intended, but this is what im talking about when I said, there are too many instances of making wild speculation, bassed on either nothing, or not being well versed in what we actually do already know.