I respectfully disagree with your assessment, but don't dismiss your theory as impossible, just far less likely. I, myself think based on what I have learned in reading and taking it all in, I believe LJ fits the likely predator category far more than the un-lucky/random accident followed by extremely bad decisions group... In fact, I have a healthy suspicion that LJ has been a longtime predator. I think LJ, who likely lost his near perfect alibi as a long time cab driver, got sloppy when he didn't have the comfort and convenience of a cab to meet and or stalk prey, either inside or outside the cab. So what I'm saying in a nutshell is I think he got sloppy, because it wasn't his typical ritual and I believe he slipped up this time (praise God). Now we just need to find the perp before he harms anyone else.
He was also getting ready to move. To who knows where.