:goodpost: I think, part of the reason it's been discussed over and over is due to the section I've bolded above. In a sense, you kind of answered your own question. However, I agree with you 100% and frankly don't give a rat's booty who pulled the trigger. I think the logic of the evidence of GSR clearly shows the shot came from the front of the truck, but at the end of the day, the person in the back never called 911 and spilled the beans.
I respect your right to an opinion but I can't agree, as we still have no idea who killed whom and how.
For all we know there may have been an argument, a third person, or blackmail involved. There are a lot of scenarios IMO, so for me to claim not to give a 'rats booty who pulled the trigger' is incomprehensible. That's just my opinion, and as I said I also respect that you have yours.