I would think that JR and DB, if they took Lauren, would not take her to their hometown or en route to their hometown. That would sink them in a trial. I keep thinking of that tweet from DB and I'm thinking he took her somewhere that night, and perhaps DID return to Bton, tweeting as if to say to LE - "See I'm still here!" I think DB could have driven 2-3 hours in a different direction to dump the body and return to Bton by 10 AM to tweet at breakfast at the Runcible Spoon. That's why his car, his phone pings and any video of every exit out of Bton is so important.
I think FBI needs to pay a visit to Bloomfield Hills and shake things up a bit. I really believe that the only thing JR knows is that he sent Lauren home and DB left the apt - JR didn't want to know anything else. That would be a good reason for the silence - they don't know what happened to her other than she turned that corner and poof, disappeared into thin air. He also knows that DB took off for the night. Perhaps DB is so high on the food chain he has put the fear in all of these POIs and "knows people" that could mess them up. If he goes down, they all go down for something.
I think the MPOI is DB and every camera within a 200 mile radius of that campus should be looked at for his car. I doubt there was a ton of traffic at 4:30 in the morning. At least find the direction he was headed. If he wasn't thinking and brought his cell phone with, there would be pings that could be mapped.
I'm seriously distraught over LE's actions on this case. If they had the phone records of every POI (pings and all), checked every car with a cadaver dog, checked every camera for a POI car leaving town, I doubt they would be searching a landfill 2 1/2 months after she went missing. I believe that they are scattered due to the number of POIs that they're looking at. I also think their focus is on the 2:51 video - but the 2:51 video was before she went to 5 North. Perhaps the 2:51 video is irrelevant and she walked on to 5 North. Are they focusing too much on something that may be nothing?
Have they even questioned DB? Has the FBI paid a visit to Bloomfield Hills? If she is not in Bton, then the body was transported out of town in a vehicle. A cadaver dog would make a hit without a doubt. FIND HIS VEHICLE.