There are quite a few assumptions that CR/MB and JR are telling the truth.
Because some facts are laced into their stories, does not make the stories themselves truth. They are still lies.
So, because JR is the only POI (that we know of) to acknowledge Lauren's injuries... We do not know if she was ever at JR's. If this is based purely on MB's and JR's word, it certainly can not be taken as fact. Because JR said he saw LS's injuries, does not mean that he in fact saw them. He could have been told about the faceplant video prior to making that statement. He could have been told about her injury by someone else. He could have saw the injury at CR/MB's but LS may never have made it to JR's. He could have seen the injury outside or in a vehicle or somewhere else. Someone may have taken a photo on their phone and showed him.... etc..
The faceplant video is the last hard fact of her whereabouts. If there is a witness other than the POI's that can back up that she was indeed at CR/MB's and/or JR's after faceplant, then they should speak up.
From the very beginning I see people operating on the assumption that all POI's are 100% telling the truth. From what we know, that just can't be.
LE has Lauren's phone. So they would have finger prints, and the record of everything happening on that phone that night, anything deleted, etc... A mobile phone today is a computer. And there would be phone company records of texts and calls. With respect to her being purposefully separated from her phone, it's a plausible theory, but as of yet, no fact to support it. LE should know by now if that theory has legs.
Still we are all waiting for a good story about why ZO hit CR. This was all on video. CR and ZO exchanged words but we do not know all of the words or what was driving the conflict. Public statements that came out initially made it SEEM like ZO was somehow protecting SW (how strange that was then and now absurd it is today) from the evil CR. If ZO had any concern for LS at all, it was not demonstrated on the video. She is just slipping down, having trouble standing while ZO and crew are not rushing to her aid. Further they just let her stumble out the door with CR. So I don't think the conflict was about LS. It is about time we know what the conflict was really about and that ZO make statements about it.
Your sequence seems a bit out of order... I've re-arranged the way I understand it:
LS is with people(WHO?) at SW who are watching BB (Person Q? is there) around 12:00 midnight (witnesses)
LS and DR go to JR's from SW to 5N (leaving at approx 12:15am and arriving at approx 12:30am). (Video and statements)
LS last known use of cell phone per CS is at 12:30am (likely she told someone she made it to JR's?)
DR leaves immediately after arriving at approx 12:30am (video and statements)
LS and CR go to Kilroys(Together is the assumption, there have been no comments about either's condition on the way to Kilroy's) (video, statements and possible witnesses)
(unverified rumor - LS is said to have boasted about taking Xanax and cocaine, while at Kilroy's)
LS and CR leave Kilroys and head to SW. (video, and possible witnesses)
LS leaves her shoes and cell phone at Kilroys. (This is the assumption, From videos it could be verified that she walked to Kilroy's with shoes and phone in hand or bulging from where she kept it, and then both missing on the return videos, this is something LE knows but we do not know.) (TIME approx 1:30am?)
LS and CR arrive at SW and go up to the 5th floor lobby but no further and don't enter anyone's apartment.(not sure if this detail is correct, but it was all on video) (TIME approx 1:45am?)
Then the altercation between CR and ZO. (Video, very little public statements from those who were there)
Then LS's out of the elevator fall. (Video, and note that ZO and crew do NOT help her)
LS and CR leave SW and head to 10th and College via the Alley (Video and possible witnesses) (TIME approx 2:00am?)
They knock on LS's girlfriends door (doors are external at 10th and College), getting no answer (They or just LS?) sit on the concrete front stoop(or stairs?) of this building. (Witnesses and possibly some video) (TIME approx 2:10am?)
Next we have LS's slump & bump on the stoop/stairs falling over sideways from a sitting position (which indicates that she is losing consciousness, not just motor control). (Witnesses) (TIME approx 2:20am?)
Then CR carries LS on his back (because she cannot walk, not because she enjoys piggy back rides) (Witnesses and possible video) (TIME approx 2:30am??)
Then at some point CR and LS start up the Alley from 10th and College towards 5N. (Video) (TIME approx 2:45am?)
LS's unblocked faceplant fall upon exit from the alley and loses her keys(not keycard or ID) and coin purse,(TIME 2:50am)
A person finds LS's keys and coin purse type wallet and places them on ledge and sees/hears nothing else (TIME approx 2:55am)
A second person (roommate of the one finding Keys and Wallet) sees Keys and Wallet on ledge (TIME approx 3:00am)
MB reports that CR and LS show up at CR/MB's apt at approx 3:00am CR vomits needs to be put to bed, says LS assists. Also says LS does not want to stay wants to keep partying. (In light of LS's condition just a few minutes prior and unblocked faceplant, these statements attributed to MB make no sense, MB does not say anything about injuries and makes it seem that CR is bad off and LS is in good shape, totally the opposite of what was observed by witnesses and on video just minutes before)
MB calls JR about LS(even though they live next door in the same building) (TIME 3:30am)
It is said by MB and JR that somehow LS goes to JR's (I've seen many conflicting statements about how LS got from CR/MB's to JR's, who was there, nor have seen no credible proof that she actually made it to JR's. The assumption has been that MB and JR are telling the truth but their statements conflict known facts and each other) (TIME approx 3:35am)
JR says he observes that LS is, to paraphrase "in bad shape". JR claims to notice LS's injuries and observes details about her toxication level, her behavior and supposedly that she only has her keycard and FAKE ID. (TIME approx 3:35 to 4:15am)
(LE disputed - Bartender witness claims to have seen LS being carried over someone's back at 3:38am just north of 10th and College)
JR says that LS makes 2 calls from his phone but that she mistakes an ipod for a phone. (TIME approx 4:15am)
Call # 1 is to DR - no answer
Call # 2 is to Person Q?
JR claims that LS passes his sobriety / walk test and allows LS to leave ALONE, BAREFOOT, PHONELESS and says he sees her walk down 11th towards N. College. He says he sees this from his little 2 foot balcony. (TIME approx 4:20 to 4:30am)