It really doesn't make much sense to drive to the other side of Abilene to hog hunt. To me, the hog hunting theory really holds no merit, some of the best hog hunting in the state is a few miles from Seymour near the Brazos river, and many of the landowners will gladly allow you to shoot hogs that are tearing up their crops.
I think the key is the cell phone records, particularly what time of the day or night the towers were pinged and where. Were there any outgoing calls or texts? To/from, when and where. From the description of the area and damage to the vehicle described by the Trooper, it is possible he fell asleep at the wheel and had a minor accident, striking a few trees. Even low speed crashes can cause head injuries that cause a change in cognition. This specific part of Texas is pretty rough and getting lost in the woods in June through August can be deadly.