Let's go with Martinez for the murder:
How was Martinez able to attack/kill TH on the Avery property without anyone seeing or hearing him? SA was home and around all day. Different Avery brothers/nephews home at different times. And then how did Martinez get TH's remains into SA's burn pit, with no alert from Bear, get TH's items into SA's burn barrel(s), get TH DNA onto a 22 caliber bullet fired from SA's rifle, and into SA's garage, move TH's car without SA noticing, park it on Avery property, remove TH's license plate, put it into the station wagon parked somewhat close to the main buildings/SA's Trailer, and then get TH's key into SA's bedroom in his trailer?
- OR -
Is the thought that Martinez was able to stop TH somewhere, not on Avery property, kill her, burn her remains, then get LE or someone to help him plant the evidence on the Avery's property? Maybe he enlisted the help of George Z and Ryan H for good measure?