Hi Tom,
No (more) wild theories from me, but it *is* an interesting paper.
Maybe the lack of water, plus the rough and rocky topography makes the search strategy in JTNP different from the other parks? If not, then the lack of focus on high points and ridges (and roads; more later on that) by the original searchers stands out. My observations are in no way meant as a criticism of the original search, by the way: the larger multipliers given in the paper for trails and low points shows why.
It seems the original foot search pretty much stuck to a single high point (Quail and the massif around it) and not the rest - although the helicopter did buzz a few alternative high points towards the end of the search period. The main energy of the search went into low points (canyons and Juniper Flats which I think can count as an extended low point area, compared to Quail, anyway) and of course trails.
As a friend who spent years in the Brit army told me: "In an emergency, civilians run down; but military men run up. It's how we've been trained to think". Bill was ex-military, so there might be something in that. Wonder if the writer of the paper noticed any correlation between the hikers found on high points and prior service record? And that ties in with numerous theories (such as Adam's) where Bill switches on his cellphone on the ping occasion only after reaching a promising location, i.e. some form of high point or prominence where (presumably) he can see the lights of civilisation.
The tops of JT high points often have large boulder piles on them, so clearing all of the nooks and crannies of even one would take quite some effort. Been a while since I google earthed the massif north of SWC, but I recall 4-5 prominences up there - and the entire length of the north side of SWC runs along the ping arc. Also no one ever cleared the three peaks north west of Johnny Lang (although I think the search helicopter buzzed it) but they're much further away from the ping. And then we have the smaller double peaked prominence just north west of Samuelsons - which is bang on the ping arc. Not sure if Adam would claim the peak/ridge on the north side of Upper Covington as already cleared, but the sourthern part of it is also on the ping arc.
Sheesh, there's enough boulder pile high points remaining for many dozens of searches.
Right, roads.
Hate to bang on about it, but no one ever properly checked out the boulder piles left and right of the Park Road as it runs from QS picnic area right up to the left turn where it starts its descent down to the JTNP western entrance. That left turn is bang on the ping arc, and likely to be the best and clearest ping arc location anywhere on the Park Road (anywhere in the park, for that matter). If Bill walked up Park during the small hours of Sunday morning when there's zero traffic, then he could have conceivably pinged Serin at 6:30am and then (after his phone died) found himself a nook to escape the rising sun (sunrise time that morning shows as 5:37am). He was intending to wait for the first passing car but gave out before he had the chance. Seems likely that the first traffic on Park that Sunday morning was (ironically) the searchers driving to their rendezvous.
The search narrative states that "I came back into service at 06:00 hours" and until just now I assumed he meant he arrived back at JF parking at that time. However, a sentence or two later he shows he's still at the station, wherever that is. The searchers went "back into the field at 7:25am" so I assume they assembled at JF parking and QS first - maybe sometime after 7am?
Ahh, cr@p. That counts as another wild theory. Sheesh. Sorry, Tom.
The other road that spings to mind is the one leading from Yucca Valley to the Covingtons. Not much cover there left or right and I suppose Tom's and Adam's endless drives along it might count as a repeated clearance? Might be worth a (boring) walk along both sides, although I can only imagine a rich haul of empty beer bottles and cigarette stumps.
Ric