I think both accused are guilty of murdering TB. They planned the truck theft together over a long time and had not been able to steal one by the time they went on the 1st test drive. Frustration and failure was getting to them both. I do think that IT got away only because they thought he'd pose a possible threat to them both. They were not going to let a solid opportunity pass again to get the diesel truck DM needed. On TB's test drive I believe that neither DM or MS were going to accept failure again. They went up TB's driveway with the full intention to take the truck and the owner to succeed in their mission at any cost, and I believe TB paid that cost with his life. I think he was doomed the moment he agreed to allow the later evening test drive. After that it was all systems go for both DM and MS.
In texts to and from DM, MS and even AM you can see DM's desperation building and he was fully prepared, and preparing others for more risky business than any of them had done in the past. It was time to dangerously escalate things and if violence was necessary to get that truck, so be it. DM succeeded in recruiting MS to be his accomplice. I think AM likely wanted no part of the plan and opted out because I believe it possible that DM had let others know he was ready to take a truck by force if need be. All DM and MS needed was the right truck and the right owner in the right circumstances. They decided on May 6th that TB was the right match to carry out their plan. They didn't have time to delay. There was no plan B to come back later to take TB's truck. Once they left the driveway with TB there was no looking back.
I believe that both DM and MS were armed and fully prepared and willing to use their weapons on the test drive with TB. Two men - fist to fist - with one victim could have easily overpowered that lone victim had TB put up any resistance and they knew it. They could have let TB live. They could have taken the truck and let TB out on a remote side road in the dead of night. They were cowards. They never planned to let TB leave alive. They took a gun or guns on that test drive because DM wanted a truck and wasn't going to keep scoping them out indefinitely. I think once he spoke to TB on the phone, DM determined that TB was a "nice guy" and that perception likely emboldened DM and MS in their plan. DM and MS thought that TB wouldn't put up a fight against two young and threatening guys while out alone on a test drive drive in his rural area on a Monday evening. I bet seeing SB in the driveway, and if TB had mentioned he just out his baby to bed, that DM and MS would be encouraged that they indeed chose a nice decent guy who had every reason to live and no reason to resist their plan. I believe they were right.
I think TB was killed by both accused once they got to the Bobcat location, a location I believe was pre-planned and one that DM was familiar with. The reason they killed TB there is by that time they were quite close to the farm and the incinerator and a reasonable distance from TB's area. I think the plan was to order TB out of the truck at gunpoint to shoot him outside of the truck and transfer his body into the bed if the truck, but something interfered with that plan. DM or MS may have shot TB before TB could comply with their command. Whichever of the accused deviated from the plan to shoot TB outside of the truck, it doesn't matter. TB was dead. TB's phone was discarded almost as an afterthought in the ensuing aftermath, in those adrenaline rushing moments. The interior of TB's truck was then covered in blood, and the mad getaway by two madmen began and the clean up and cover up went into full swing. Together. Two monsters that created a living nightmare. Together. And the accused stayed together throughout that terrible night as they coldly continued on. Together at the farm they put TB's body into the Eliminator. Together they headed for the hangar where together they incinerated TB's body as the truck was getting stripped and being prepared for SS to do his thing with the VIN and a repaint job would soon be in the works. The only f-up of their plan was TB being shot inside the truck. All in all though, the next morning they were each celebrating mission success and thinking they had pulled off a brilliant crime. Perhaps I should say another brilliant crime when I think of LB. Neither DM or MS expected TB to be making headlines at all, let alone in the immediate days after he went missing. LB had, by May 2013, been missing for almost a year without much public interest in finding her after all. I believe that DM and MS thought they got away with the crime of the century - perhaps twice - no reasonable doubt in my mind. They thought they were the untouchables. They were deluded.
DM and MS by their own intentions, words and actions before, during and after TB was killed, convicted themselves. No matter how bizarre and unbelievable each of their stories are as they each get their versions out to the jury, I do trust that the jury will see that the only thing that makes any sense, given the totality of the evidence in the context of the big picture, is that both DM and MS were compatible partners, each with a need - one for a diesel Dodge Ram truck - the other for a classic Cadillac - and as difficult as that it is for the average person to comprehend or accept, the truth is that they both planned and equally participated in the crime. They should be held equally responsible for TB's murder. The alternative fictional theory penned by DM in his letters to CN or communicated for him through his lawyers, or the other creative twisting of the truth by the rap lyricist MS are not convincing. Thankfully these two accused turned against one another because that fact did provide a good glimpse into their characters and credibility, but for me, the Crown's version of events is convincing and once they sum it all up, I am hoping the jury will be convinced too.
All MOO. All of the above is my own opinion and speculation.