I've opened up my mind to all possibilities. I think everything here is important just based off of the cell phone information.
As you've said, we cannot even be certain that the 1/5 to 1/3 mile radius is correct, since the only mention of it came from the defense team. Do we even know if the 3:17 calls are accurate? Did that come from LE or from 'sources'? Do we know if other calls were attempted that we weren't told about? At some point, we have to trust some of what is being told is true; otherwise, sleuthing is a waste of time.
It's very easy to get to the river. I'll always be open minded and know that there are some really great flashlights available on the market today, even the kind you can strap to your head. If you say so. I'm not from the area, so have to believe what you locals are saying. The problem is that the locals differ in opinion on how easy it is to get to the river. DB may well have a head mounted flash light, but somehow I would bet she does not.
In the video I took driving from the home on Lister to the river area, you can drive all the way back to the tracks. Once you get to the tracks, you can drive along a dirt/gravel road that runs east along the tracks. I can personally throw just about any cell phone that's on the market from the tracks into the river and I'm no major league pitcher. Keeping my mind open, I know there was a white Lincoln at the residence that night that the family is still driving today. At 3:00 in the morning, all of the neighbors appeared to be sleeping. I'm sure at that time of night/morning someone could easily leave in a vehicle and return in a vehicle. Someone could have also drove west on that same road where it dead ends and been even closer to the river. Any vehicle could have drove down in that area, we don't even have to consider it being a white Lincoln. This is the time during the night where most people are asleep and traffic is very very minimal. I'm simply implying cell phones got thrown into the river. It could have been from that particular road, or it could have taken place off of the I-435 bridge. Once again, who knows how often a cell phone pings? I can drive from Brighton and 210 highway and be on the I-435 bridge within 90 seconds. There are at least 3 easy access points to toss phones into the Missouri river. Two of these are without a doubt possible to do undetected. One near the tracks on Birmingham, the other on I-435. The only difference between the two is the fact that one situation has you driving a vehicle across a bridge, and the other has you outside of your car doing it. If nobody was awake to hear someone prying a screen off of a window, I think realistically driving away in a car would be just as easy. Pulling back in killing the engine takes away half the worry. DB driving a car to dispose of BL is not something I've considered probable. A possibility? Almost everything is a remote possibility.
I also take into consideration that from 11:57pm through 3:17am, if a phone call attempt was made to Megan Wrights cell phone looking at this from an intruder standpoint, you would have to believe the cell phones had already left the residence along with Lisa in order for someone to try to make a telephone call and not worry about alerting the homeowner who was reported to be passed out in her bed with all of the lights off in the residence. So for 3 hours and 20 minutes, I am certain without a doubt if someone took Lisa at 11:57pm or just prior to, those phones would have shown some indication of travel at some point in the 3 hours and 20 minute window. If we try to go with another theory of Lisa being taken prior right around 11:57pm, did someone sit in the woods for over three hours using an internet browser? I'm sorry, but if I were only going to the grocery store to steal a pack of bubble gum, I think i'd want to get the heck out of dodge and right away. An even more serious crime of this nature? I really don't think I'd be hanging out in the neighborhood for more and a minute.