Part two of "Ewasko's Last Trail" is now up at https://youtu.be/2J9wsJb8P1Y.
The video is over an hour long and after a visit to the site of Bill's remains runs down all the theories and new information and tries to reconstruct what actually happened to Bill. I want to note that though he disagrees with some of my conclusions (and I think will offer his in due time), Tom Mahood cooperated fully with the video, providing much information, maps, pictures and constructive criticism. It could not have been done without him and I thank him profusely for being on board, while at the same time giving me great freedom to reach my own conclusions from the offered evidence. A class act.
Whether I got the right answer or not, there's a lot here to chew on for backcountry hikers. One of the most striking things that turned up during research for the video is that none of the large scale maps of the time showed the very obvious old jeep trail we believe Bill was walking on (but did show the largely theoretical Mary and Panorama Trails to the north in the area where he was found). This was rectified in later editions but Bill may well have thought he was on the California Riding and Hiking Trail which, coupled with either outdated (Keys View) or incomplete (Harrison/NatGeo/Park) maps, seems likely to have played a role in why he didn't make it back to his car.
I'm especially curious to hear the reactions of experienced desert hikers to the theories and ideas put forth in the video.