Just providing a bit of an update.
You can read a small article here with some input from my dad.
'Hold on to Hope': How a Missing Hiker Survived for 5 Days in Guadalupe Mountains National Park - Outdoors with Bear GryllsIt's not entirely factual but it's relatively accurate (no search dog found him, BORSTAR found him and the ranch owners dog jumped out and stepped all over him which was kind of funny since he doesn't care for dogs that much). He also spoke with the writer before we learned a bit more information, I'll share below.
One of the things that bothered me with my dad's story was he referenced a campground close to where he eventually lost the trail. I asked if he was thinking of the Mescalero campground because that's the only campground he should've encountered but it also would've been very early into his hike. But he insisted it was the Marcus Campground. Now the thing with the Marcus Campground is it's not actually on the Marcus trail, it's instead close to the intersection where we thought dad lost the trail and headed straight north.
Well this last weekend I guess he figured out to how to access some of his mapping on his phone and could see his route at least until the phone died. So he actually turned west onto the bush mountain trail going to the Marcus Campground but never knew he got on a different trail and clearly missed the trail heading east.
https://imgur.com/a/Ed2FATVI think he was basically just following the trail and likely didn't notice it split. I also think he referenced a sign for Marcus Campground so possibly saw the sign with no other directions on it and got confused thinking it was on the marcus trail and followed that direction without checking a map.
He eventually lost the Bush Mountain trail anyways and decided to "turn right and head east" towards the trailhead but he didn't know he was headed straight west at the time. So he actually ended up cutting a trail up north. This also explains why he thought he was found much further east than he actually was. Now there was obviously a significant amount of wandering around done up in that northern section but by the end of the second day he didn't have the energy to realistically hike back south to the trail.
Otherwise, he's doing pretty well. Still has swelling in his feet (from overuse according to the doc) but otherwise doing ok and got to spend Thanksgiving with his 10 grandkids which was extra special.