Then there is MB. Innocent of the crew, he was writing 2 papers. If so, why did he allow LS to linger for what was reported as "about an hour"....so from the last ally video at 2:51 AM, most likely minutes later MB was putting CR to bed, and LS just hung around to about 4:00 AM while MB, who didn't want to party per his report, was writing his paper. What else took place in that hour?
Lastly, I'm intrigued with the Romance. JW and LS relationship, but maybe ended or nearing end per rumors, a possible new romance with CR and LS. Or possibly an old flame/lust relationship from childhood between JR and LS, that could have been one sided and just exposed that night or at the 500. And of course there's the possibility of just a non-relationship lust upon an opportunity, by anyone involved.
I've read rumors that LS tended to wear out her welcome. If that's true, it may explain why she was at MB's for an hour even though he wanted to write his paper. That time could have been spent with her begging him to party, and him begging her to leave. Perhaps JR wasn't interested in partying anymore either, which is why she left there.
I've also considered this (and I honestly do not mean to imply that LS is "trashy" but just that this is the behavior of some college girls).....if she was recently broken up with JW, she could have been on the rebound. CR was her contender until he was put to bed. She then tried flirting with MB who presumably wasn't interested, so she went to flirt with JR. IF she left JR's, perhaps it was b/c she realized he wasn't interested either. I also think that this theory could be debunked with the idea that presumably at least ONE out of three guys would have jumped at her potential offer. (I now feel awful talking about a young girl in this manner but its' something to consider as this happens OFTEN on campuses - it's pretty common behavior.) This theory might explain why LS did leave JR's. She was getting nowhere and perhaps she really did go to turn to JW.
IMO something either happened at JR's or she left there for a purpose other than to go home. If she left, I think it's WAY too coincidental that she would have been abducted right at the corner, before being seen on a camera. However, I think it is possible that she crossed that street, out of camera's view, as others have pointed out the possibility. She could have been going to JW's or someone else (someone whom she knew would party with her). Maybe she never left THAT place instead? My point is that at 4:30 AM, with her presumably drunk or drugged (and we can suspect that if we believe JR told HT that he would watch to see if she stumbled), I'd think she would have rather just curl up on a friend's couch, before making that journey home, if she was truly ready to retire for the night. If she left his house, I don't think "retiring" is what she had in mind - either sex or partying, or both.