It really wouldn't be that suprising, as I can see some of you would agree, if he was eventually found within a fair concentration of GPS tracks. I've heard of too many cases where remains end up being found in areas already "searched." It can be easy to overlook something, especially when the topography increases with complexity. I usually hike much faster than the average Joe when simply backpacking, but find myself quite slow when searching in JTNP. Too many places for a person in dire condition to hide from the beating of the sun. I feel compelled to look in every rock crevice and juniper bush.
I also don't place too much weight on scent dogs and helicopters, though I think they are invaluable tools in search and rescue. A segment of Unsolved Mysteries, called Vision Quest, was filmed in the New Mexico Bootheel (
https://youtu.be/99W8NGaAzms?t=714). It involved a stockbrocker and former D1 football player who, having recently become involved with the New Age Movement, went on a vision quest and seemingly vanished. Searching on foot, on horse, and from the air failed to give any indication as to where this guy was. Bloodhounds, on loan from the New Mexico Penitentiary, failed to pick up his scent even though they were within 200 feet of his body. If you watch the segment, you see that the bloodhounds led their handlers completely off-track. The whole time his body was 200 feet to the right from right around where the dirt road (shown on a rudimentary map in the segment) begins to pass through the mountain range. Just over three years from when he disappeared, a javelina hunter spotted his bleached bones from up on a ridge. Sniffer dogs are always at a disadvantage when it is dry and hot. They were searching for David Stone in early November. I can't imagine how disadvantaged the dogs used in the search for Bill in June were.
As for helicopters, I was actually rescued by a Border Patrol helicopter when the agency volunteered a helicopter and a few men when I went missing in 2009. I consider myself a very careful and precautious hiker nowadays, but I used to be a damned fool. An early Saturday morning dayhike in the Gila Wilderness in NM turned into no food and water for two days, getting through nights in the low 40s in a light short-sleeve shirt and basketball shorts, and getting no sleep because of how cold it was. Still, as torturous as these nights were, I would opt for these over the heat Bill was faced with. Anyways, I told nobody where I was going and the friend I was with only told his wife...and we ended up going elsewhere on a different forest road than what she was told. A forest ranger spotted my friend's pickup two days after we started the hike. A few hours later, from the top of the mountain we had settled on two evenings prior, we spotted a helicopter miles away in the distance. Later, the helicopter flew directly over us twice. I thought for sure we were spotted, but felt quite defeated when it soon zoomed off to search in an area much further away. It's pathetic, and a story in and of itself, but I actually got lost while I was already lost hours after that (lol...seriously). At this point, I began to seriously question my mortality. I was off on my own at that point. I got incredibly lucky to find a mud puddle and filled up bottles with dirty water that allowed me to carry on, because I began to believe that staying put might just mean "waiting to die." Staying on flat ground, because I couldn't take but a few steps before having to rest on an ascent, I hiked for about three hours and hit a big canyon with a precipitous dropoff at dusk. Dreading another night in the cold, this time away from the warmth of another human, the whirring of helicopter blades soon came into focus. Having began walking parallel to the cliff that had blocked my path, I quickly came up to the cliff's edge and began wildly flailing my arms at the helicopter that was following the path over the canyon. I've never felt such relief as when I saw them spot me. Luck was obviously on my side, because I could have simply been walking into oblivion when I set off earlier. Finding a clear spot to pick me up, I indicated the direction from which I came and we headed that way to look for my friend. We had but 20 minutes before it became too dark. Ground searchers found him hours later based on the time and general direction I stated from which I came (which I thought was very impressive on their part). My friend would tell me that that we had flown right over him. I couldn't understand how they couldn't see us from the helicopter when I was on the mountain with him. I was equally as suprised that we had flown right over him when I was in the helicopter searching from the air myself.