I do not think that the 12:16 phone use "clue" was stated to point out that anything sinister occurred, such as pre-meditation, as some have suggested. This info alone may have meant that to me, however CS also said something like "911. Three numbers that could change your future." (paraphrasing from memory). CS was quoted as though someone had a CHOICE to call 911 and didn't. This choice is usually made after an accident, or a murder that was done spontaneously. People don't generally pre-plan a murder, then chose to call 911. It's clear to me that CS believes this was an accident and that someone made the decision to not call 911, and that that decision will affect the rest of his/her life.
As to what the "clue" is really pointing to, I think it has something to do with a connection between two important statements:
1. You should ALWAYS have your cell phone with you.
2. Lauren last used HER phone at 12:16 (but didn't leave it behind at Kilroy's until two hours later).
Put those two together, and I think that's the "clue". If Lauren ALWAYS kept her cell on her, and used it often (as has been described), why the heck wasn't sure using it for two hours, during which JW was supposedly trying to reach her. This tells me that either CD thinks that JW was NOT texting her as he says, she was ignoring him, or she wasn't using her phone. If it's the latter - why?
As for JR, his statement to the effect of nobody wants him to talk to ruin the case, I think that's pretty big. I think he would likely have said, "My attorney has requested that I not speak with you." if it was regarding himself. However, IMO this sounds as though he's been asked by many to not give any statements. Having been the victim of a crime myself, I know that LE will often ask you to not discuss the case (even when there isn't much of one). We do not know what they have, however. Perhaps there's more of a "case" than we suspect and maybe the landfill was just served to find the evidence they need to convict - a body. If they do not think that they have enough evidence for a conviction, they won't make an arrest yet, so they may have enough info, but just need the body. When CS keeps requesting that people talk, it could mean that she wants someone to tell them where the body is. They do seem to keep saying, "We have to find Lauren" as opposed to "We want to find whoever did something with her", even though at this point, I think it's pretty clear that they know that someone did do something. JMO