Great questions! Here's a scenario I have considered:
Hypothetically, say someone's adult child is involved in a relationship that one or both parents, as well as people in the adult child's close friends/family circle, do not approve of. Could be for a variety of reasons.
Let's say, while traveling out of state, the adult child (I will refer to as AC) has an encounter with LE and someone within their circle believes that if it weren't for the romantic partner, AC would never have been put in such a precarious situation. Perhaps, it could have even infuriated someone in AC's inner circle. Eventually, AC is convinced to separate from their partner and return home alone for a bit (for whatever reason).
During conversations while AC was home, someone within AC's circle, could have become livid at the possibility of more accusations being made about prior incidents and that AC could face some sort of charges for previous violence in the relationship that may have been documented (video, audio, photos, witnesses, etc). They are adamant AC may very well have had his life/reputation ruined by the situation and romantic partner.
Could someone other than AC (but within AC's inner circle) have decided to take matters into their own hands? Could they have traveled to where the partner was and had a confrontation that ended in a homicide?
Anything is possible, especially without knowing the whereabouts (during that time period) of those close to the situation.
Weeks later, AC is found deceased in an area previously searched extensively by LE. BUT the remains are only found by LE after someone in AC's inner circle discovered an item belonging to AC within feet of the remains. Video from the scene shows someone in AC's inner circle making a beeline to the item. Coincidence? Maybe.
Perhaps AC did commit the homicide completely alone. Could someone have gotten rid of AC so he would never talk (if others were involved) or because they blamed AC for causing such a nightmare of events (if he was solely responsible)? Without access to a lot more information, it's impossible to say what actually happened or why.
@Trooper the points you brought up are very valid. Large parts of the narrative portrayed thus far just don't make sense when the details are scrutinized.
*All of this is pure speculation and IMO and not necessarily what I believe happened. Only discussing other scenarios.*