I thought of this a while back. I cant remembe if it was on the day she went missing, or a different day, but it looked as if based on her tweets, or the timeline, she was going to be late.
I also wondered if the bus driver could confirm whether SL took the bus EVERY single day? This to me, would be one of the most important clues, but I have never seen it stressed by LE of the media.
If she took the bus EVERY single day, then the day she went missing something very out of the ordinary happened.
But if she never took the bus on fridays, or once in a while she didn't take the bus, then the potential perp may have given her rides in the past.
I would think if it could have been established that SL took the bus every single day, then LE and the media would have made a point about this. I could be wrong with that assumption though.