Haven't posted much in this thread but my personal feeling is that once the myriad of suspects, motives, and legal issues are all sorted through, Occam's Razor will apply and it will end up being much simpler than expected. My money is on KW. As to why there hasn't been an arrest, well, this is a super high profile case and every possibility, no matter how far fetched, must be eliminated first. The TPD is under a microscope here, no doubt about it, and I'm sure they want to dot every i and cross every t!
I wonder if KW knew the layout of the house and about any security cams, doors being locked or left unlocked? I'm sure 1 other person did mention about security cams to BS at some time. The other guy (MD)who spoke up and did an interview for The Fifth Estate segment .