Ok... Perhaps..Motive?
Deliver her unconscious to the people she owed money to... Or they drive somewhere and "the others" take her... . ? It's possible as long as blood wasn't in MR's car since LE searched it.
I don't think MR or CP would rat each other out without significant pressure from LE.
It's definitely worth questioning everything that CP, MR, and MR Sr. have said. I think it's work while coming up with a bullet-point timeline that excludes all of the times and info provided by those three people. If we only rely on times and reports from more reliable sources (the text KS's brother received, KS's friend at the pizza shops, 911 calls, police visits, the neighbors' accounts, the text and video of CP at 7:30 the next morning), something might jump out at us.
I agree with posters who have questioned Sr's comments to the press. If my relative was being interviewed by the police in connection with someone's disappearance, I certainly wouldn't be assuring people that their eating and smoking habits hadn't changed. MR & CP were just being interviewed at that point, and still haven't been named as suspects or persons of interest. Why come out and more or less blurt out "They didn't do it, I would know"?
Gas Station Pub encounter could be random. But, if the rumors are correct, CP and MR are friends with the person who is owed money. What if they contacted this person after meeting KS at the Gas Station to say something like "you-know-who is here and her bf just got locked up, you still want to talk to her about that money?" In this hypothetical, even if they set up a meeting, MR and CP don't necessarily know what happened, but could have taken the approach that this is between KS and her connect/dealer, it's got nothing to do with me, they didn't know what was going to happen.
IMO, it is likely that KS was not present in the apartment for the last LE visit. Two neighbors said that they think KS left her apartment and something happened to afterwards. LE supposedly knocked on KS's door and neighbor's door, but no one answered.
What if, after hearing stomping and banging and calling 911, neighbor looks out the window and see KS leaving (or being dragged away by) some sketchy characters. At this point, the neighbor's already gotten into an altercation with KS, and CP has exchanged words with him. Now, maybe he sees the "others" and decides its best for him not to open the door. He knows them, or knows them by reputation. Neighbor has been in the system and knows that there's "traffic" in and out of the KS apartment. Loses stomach for talking with the police again that night. If KS left with the "others", left with MR, or left by herself to meet them, she isn't there to open her door. CP doesn't live at the address, has just let KS leave with sketchy people, and doesn't like police anyway, so he's not going to answer the door. (Assuming he was even there for the last LE visit). Also, can anyone verify whether CP told the story about KS stomping on the floor before or after the news reports about the second noise call? While KS may have lost her temper earlier, do you really stomp on the floor, knowing that police will come, when your running in the circles that KS does?
Thanks to all for the additional details on LE in the area. I stand corrected in that there does seem to be more "smoke" here. The detective engaging in relations with his CI is definitely interesting. The second dismissal is more vague, but also interesting since it happens after KS's disappearance. These facts, and the apparent lack of progress, would definitely make me push for state LE and FBI involvement if I were KS's parents. Even if there's nothing untoward about LE's handling of the case, it makes sense to involve a new sets of eyes (and with more resources). Plus you aren't relying on local LE some of whom are related to people in KS's circle.
The CI angle always seems to be suggested when someone disappears and there's a drug angle. It's worth considering, especially since nationwide there have been many many tragedies involving improperly handled CI's being murdered and going missing. See the NYrker link if you want further reading on this topic:
http://www.newyorker.com/reporting/2012/09/03/120903fa_fact_stillman?currentPage=1
Federal Witness Protection, or Witness Security, doesn't seem to come into play here, since there must be federal involvement and this protection is usually only provided in the biggest cases. Would think that FBI would be all over this if KS was in some undisclosed location with U.S. Marshals.
A word of caution on the CI theory though: It's dangerous to suggest that someone could be a CI. Lots of paranoid people in that world. Not worth throwing around the possibility (whether it's true or not) when it could jeopardize someone's safety and reputation.