I think the first part is even more so true now while the lawsuit is ongoing. Even if they didn't do it, I'm sure it is on their minds quite a bit simply because of the lawsuit.
I also hope the second part is true, although if they did do it, I've always wondered why they would come back to school the following fall. I know they no one would want to draw even more skepticism, but still, if involved, that's pretty gutsy. Even if it was one of the other POI, I'm pretty sure they all came back the following fall, including JW.
Did anyone's behavior change in that time period? Did the Spierers try reaching out to JW then when his parents weren't around?
JW made it pretty clear that he blamed the 5N group based on his actions the following days and later that fall when he supposedly had a friend threaten JR if JR didn't leave a party - why? Did he give this explanation to the Spierers at any point?
Why was the landfill searched so much later? Was it mostly because of public pressure, in part fueled by the Spierers? Even if it was fueled by the Spierers, had they found or heard information (via their PI or otherwise) regarding the landfill? How thorough was the search? I've heard it is difficult even when you know a person is there somewhere. How sure are they that even if there were rumors she was put in a dumpster, that they used that particular dumpster (my understanding is that they pinpointed the area of the landfill to search based on the dumpster)?
RE social media: I remember seeing pics awhile ago (but after graduation) of MB with JR and DB, so they appear to be friends still. It also makes me wonder if DB (and possibly any other guests) was friends with MB (and possibly CR?) at the time, does that change the dynamics? Then it's not DB/guests getting involved with strangers, but people they might consider to be friends? I still think that would be pushing it if DB/guests/JR had nothing to do with it, but still, I have a hard time believing DB/guests would agree to anything for people they didn't really know.