One thing about Janet NOT being moved and the other cases, look at Mark Hacking, he had to get rid of his bed, his downfall, he was suppose to be out looking for his wife yet he went out to purchase a new bed - why? The blood, of course.
Janet was stabbed, hence blood, blood trail, etc. If Janet ended up reported missing, the police come in, you can scrub all day, but you are going to miss some trace evidence of the blood, which would point back to the fact she was murdered in her home.
Another thing, how to move the body with Kaiden there, and not alert suspicion.
Laci was strangled, no blood, easier to move.
I think someone knows a heck of a lot more about this than they are saying.