There is someone with his name on Facebook:
Nestor Manuel Cabrales
Lives in Rancho Altar, Sonora, Mexico on FB.
From Sinaloa, Mexico
Looks like a middle class guy, with friends on both side of the border. Married. Posted ultrasound pic July 7, 2012. Last FB post July 8, 2012. Posted with group of friends. He even has a pose that looks like the bathroom pose. I would post the pic, but don't want to violate TOS.
He has a possible brother who is the same age as him who moved to Phoenix, AZ in 2014.
Maybe they crossed the border just to cross and he somehow got away from the group. I can't picture this guy going shirtless in the desert because he's from the desert himself. This is the kinda group who would have driven up to the border themselves.