I grew up in the part of Texas where Landry went missing.
The land does have grass, but also prickly pear cactus, and mesquite trees full of thorns, and fire ants, rattle snakes.
And at night there would be coyotes, wild dogs, mountain lions, and possibly wild hogs.
If he crossed paths with any of these- compromised by drugs or mental breakdown, he lost. Anything left of him may have become food to hogs.
Hogs run in packs at night and eat just about anything, including bones
People that live out in those areas do not welcome strangers poking around.
Tragic story, senseless
IMO