Means, motive, opportunity.
Means - if someone lived in a nearby town, had the financial resources to acquire gear, had the ability to case the scene, to research the victim's schedule and whereabouts, had the ability to leave the scene and return to a 'normal' schedule that day.
Motive - if someone were terrified of losing the family unit, protecting that family could be motive. The person could have been jealous and/or afraid that the spouse was not attracted to them and was looking elsewhere for what should be kept within a marriage. The person could have a controlling personality or a personality disorder which may lead them to embellish actual facts into something much, much worse. Or maybe something much, much worse was actually going on. In either case, if someone was so consumed by control - this could be motive to do away with the one person who was so threatening to the family. That person could be threatening in two ways - taking the spouse away and/or threatening the financial means of support. This person could have portrayed (perhaps even on SM) a lot of controlling, perhaps narcissistic, characteristics that do not fit the profile of an emotionally healthy individual.
Opportunity - if prior to the crime, someone had some time alone, they could have had the opportunity to be in the vicinity and case the crime scene, could have had the opportunity to assemble the gear needed for the crime. If the day of the crime, one's family were away and/or left the house prior to the needed time of departure, one could have gone to the crime scene, committed the crime, and returned home without detection. Even perhaps disposing of the gear along the way, perhaps along a back road, into water, into garbage facility, etc.
Of the original target number list, means, motive, and opportunity have pointed me in one direction without any rumors involved. Especially with physical similarities to the crime scene video. Time will tell.