I also just joined the forum (I came across it following Lauren's case) and just have a few random thoughts that I wanted to note:
(1) I assume that the basketball game that JW was watching was the first game of the NBA finals. The game was in Miami and started at 9, so it should have been over by 12 at the latest. Didn't HT say very early on that LS went with DR to watch a basketball game with JR/CR et al? That doesn't make any sense given that she didn't leave until 12:30.
(2) I don't know what to make of the 4:15 phone call from JR's phone (supposedly LS) to DR; however, I do think it's possible that LS made the call... indeed, I think that would be less weird than JR making the call. If LS made the call, it could be because DR was carrying her phone for her when they initially went over to JR/CR's and she drunkenly thought that she never got it back. I don't think the call v. text is that weird if she assumed DR would be sleeping and was trying to wake him up. It was, after all, 4:15 in the morning and she knew DR went back to his place 2 or 3 hours earlier. If JR made the call: why? The only possible explanation I can think of is trying to establish and alibi, but it seems a weird/unlikely way to do it... and what if DR had picked up? I just do not believe that JR called DR -- over in a different apartment building and likely asleep for hours -- to help cover up an accidental OD/sexual assault/anything else.
(3) I don't think that anyone from Smallwood who police can confirm entered when they said they did, are never shown leaving on camera, never swiped their door keys and are then seen exiting the next morning when they said they did are really suspects. That to me rules out DR and HT more or less entirely unless police are withholding critical info.
(4) Similarly, I think it's unlikely that JW could have made it all the way across town to intercept LS somewhere without turning up on a single camera or being spotted by a single person. If he did it, I think it would have been spur of the moment/rage-driven and it's incredibly unlikely he would have miraculously avoided all detection before the fact (i.e., before he knew there was a reason to). Again, I believe JW is ruled out unless LE is withholding crucial info.
(5) That leaves the guys who live in the JR/CR/MB/etc building or a third-party (likely a stranger). Since JR/CR/MB/etc would already have been in the area when whatever happened happened (if it did), their presence there wouldn't be strange if confirmed by camera or otherwise. I find it a lot more believable that they would be able to evade detection/cameras after whatever happened, since they would know that they needed to do so. (My only extra question here would be: Is there any possibility of an overlap between the guys who got into the altercation with CR at Sports and the residents of the buildings that CR/MB/JR live in? The same logic would apply to them.)
JR is obviously the most suspect of these guys since he has self-reported seeing her last... but MB also doesn't have much of an alibi. Suppose JR is only guilty of letting LS drunkenly stumble off and is now too embarrassed to say that he made up the "seeing her to the corner" story (which, as previous posters have illustrated, doesn't make that much sense anyway) to cover his



... Is it possible she would have gone back to CR/MB's to try to retrieve her phone (or keys, if she noticed those were missing too) there? If so, we have MB's word that he put CR to bed... but couldn't that theoretically leave MB without an alibi? And, unlike the others, we know he wasn't drunk. Of course, MB could have been in bed on her return and this same logic could apply to their other mystery roommates instead... we have no idea where they were at that point.
Anyway, the above isn't to say that MB is guilty... I have no reason to think he is. It's just to say that LS could go between apartments in JR's complex without being spotted on camera, so it seems like the answer could plausibly be in any of those apartments.
I really wish that LE had released the info of who passed a lie detector at the very least... while not perfect, it would give us a better idea of who's story to use as the base story against which to compare the others. I also wish they would tell us more about who was home in the various apartments at various points. My best guess is that CR, at least, passed a poly, since the police seem to have backed off him a bit.