I agree with monkey222 on checking all video in the 3am time frame. We are assuming that: 1. LS made it to CR's.
2. MB took her to JR's
3. JR saw her leave.
What if none of this happened. From the last time LS is seen on video she may have vanished then. Anything that has been proven after the last time LS is seen on video that makes this theory invalid?
How did she vanish then? And even assuming she did, why in the world would MB and JR say CR showed up with her in the apartment? I sure wouldn't lie to cover up for someone when that could make me a suspect.