I did try this entry point over the weekend and it was fairly easy to get down into Quail Wash from JT Village. Much nicer walk than the horrible slog down and back from Park Road (which isn't difficult so much as tedious).
I sent in a report to Tom and posted a video here:
https://youtu.be/xBocFWbNZowI thought after getting out there I finally had a scenario for Bill's disapperaance (that doesn't involve any tin-foil-hatness) that I could buy. Once I got home and went through the tracks and Tom's previous reports, as often happens, I got more doubtful...not that it's a bad theory but that the most likely areas in question has been more heavily covered than I thought. I sketched out the idea on my report, but it basically says that Bill gets turned around up Quail Mountain, takes a while to get down after some kind of injury, starts heading up Johnny Lang to Quail Wash, phone pings at 10.6 at Quail (where there is reliable reception), the phone immediately dies (because otherwise he'd just call out) and proceeds onward to the north from there and expires.
This requires a couple of dubious things to happen (the phone automatically dying, Bill not turning towards Park Road or water in SWC, missing the searchers who are nearby hours later, somehow deviating from Quail Wash when he's only a few miles from safety, not pinging a tower earlier, etc.), but it at least makes topographic and timeline sense. It doesn't require Bill to do anything totally illogical or beyond his physical ability (e.g. climbing a huge mountain when there are easier routes available to him).
More to the point, because of the topography and proximity to roads and trailheads, I can't think of a single plausible place outside of Upper Covington (which is itself a stretch) for Bill's phone to go off at 10.6 besides Quail Wash. I know it seems like there's lots of places, but when I go through the problems with any single other spot, I just can't buy it (and this is ignoring the reception issue). Can any of you?
When the report goes up and people can see the map of the tracks, I'd love to hear peoples' thoughts about places Bill might have gone assuming that's where the phone went off. There are areas north of the SWC canyon mouth that I think could get looked at harder on the chance that Bill was heatstroked and wandered somewhere unlikely. It might make a good candidate area for others on the board who want to look around. It's not particularly difficult terrain and it's fairly easy to access from JT Village.