Based on the thought that the initial shots that Pam and James suffered was not at the body dump site, do you think it's possible that Pam and James picked up someone or befriended someone from the area and spent some time with them in their home which is where things went sideways and they were shot? Then the killer(s) bundled them into the rear of the van, dragged them out of the vehicle and shot them again in the chest and the throat. They'd be driving around in a vehicle that was covered in blood. There's so little blood on the bodies, though. You'd think Pamela's top would be saturated in blood being white.
I think gunshots using a .357 with .38 bullets wouldn't exit the body if they hit bone. They found bullets on the ground where the couple were found so which bullets were they, the bullets from the chest shot or the head/throat shot? You'd have to ensure that the bullets wouldn't hit any ribs, front or back to get a through shot unless the person shot them just under the breastbone angling down through soft tissue if they were straddling the victims. A throat shot could have been a through and through. Unless the reverse happened, the throat shot ended up in their skull and the chest shot was a through and through. Being shot in the chest doesn't necessarily mean through the heart, it's a pretty big target. Although if the victims were lying helpless on the ground before being finished off would be easy to shoot them in the heart.
I'm just trying to understand what the state of the bodies was since for decades I've been under the impression that all shots occurred on Locklair Rd.
I wonder if Lonnie Henry was covering for his brother who said he gave the weapon to him in the early seventies when in reality he was the owner of the weapon when it was reported stolen in 1974.