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Foot and Ankle Structure and Function (terms of service allow use of their pictures for public education).
That's what the bones of the foot look like. I don't see any of them in any picture - but the Calcaneus would be the one that maybe you sharper eyed people could spot.
It sure does look like some of JRF's clothing is found in conjunction with his body which, to me, means that he likely was more intact and, well, wearing some of his clothes when the August rains came.
I also think
@Herat's view that some of these findings could have been washed down from up on a flat to be very convincing. That would have been around August 23, IIRC. Mid-September, they would have been in that wash for almost a month.
And I think the blurred shape in the second photo could be a number of different bones. Keep in mind that the pelvis looks different when it is in parts. Scapulas are also possible.
Can anyone say whether they think the shape is like an ilium or more like the lumbosacrum? Those are other candidates for a larger, flatter bone.
Anyway, diagnosing death from heat (or thirst) are two of the hardest post-mortem calls that a forensic team can make.
Ruling out foul play is a bit easier. If it's true that the truck was below them (at the Pinyon Wash trailhead area) and if they did make it up to Harper Flat through the Pinyon Canyon/Wash trail, the only thing that comes to my mind is in fact heat exhaustion. I don't think they both took a fall and became incapacitated (although if they, for some reason, decided to scramble at some point, maybe).