Here's the one big thing that really bothers me: I don't care how carefully this was planned and set up - it's really hard to get three people out of a house without some sign of struggle as you abduct them. And there is no conclusive proof the light globe was damaged by a struggle.
There just wasn't that much time to stage the house, so any staging that was done must have been quick. Like lining up the purses, but not resetting furniture knocked over in a struggle.
Though the likelihood is really small, it makes me wonder if the abduction took place elsewhere even if it was just the front yard.
I know here are three competing theories currently:
1) Silence
2) Sexual predator
3) Serial killer (which could be a subset of #2)
The one I feel most likely is #1, but I wouldn't totally rule out another scenario. The few facts we know fit better to #1 in my mind.