Has there been anything to support the idea yet that they are arrogant yahoos? I don't think even AS called DM arrogant (unless it is synonymous with 'spoilt brat?) and there have been several reports from others such as the real estate agent and the boat rental man who have met or known DM who say the opposite about him, have there not? And honestly, who steals a truck for kicks? Teenagers, perhaps drug addicts or hoodlums from the ghettos who can't afford other forms of entertainment, and even those are rarely stolen by car jacking, most are stolen while unattended. It is a very small percentage of people who actually get a kick out of stealing things, and those people are called kleptomaniacs, and from what I have heard, it is very hard for kleptomaniacs to make it to their twenties without at least one prior theft charge. So I would have to assume that it was not a plan to steal it for kicks, in my opinion.
Tattoos are identifying marks, people who have tattoos know this. If you are ever charged with a crime, the first thing they do is catalog your marks, scars and tattoos, so anyone planning to commit a major crime, would have to be ridiculously stupid not to at least attempt to cover them up, especially if it could be done as easily as sticking on a bandaid. Basically even if they intended to do the one crime and not the other, they would have still put a little forethought into avoiding detection, in my opinion. For instance, if stealing a truck was the goal, as you suggest, why would they pick the hardest type of theft, car-jacking, over a type of theft (stealing it from the driveway while the owners are sleeping) that would have been far easier to get away with and leave no witnesses and give themselves longer to get away before the theft was detected? If it was planned by DM and MS, there are a million small ways that it could have been planned better. But if it was planned to make it look like the perfect set up, it couldn't have been planned better.
I would really appreciate hearing why you think the idea of a frame up job completely doesn't work for you. There are at least a few framing scenarios that fit all the known facts so far, in my opinion. They even make the more mysterious aspects, like the fact that TB's phone wasn't turned off until about 30-40 minutes into the test drive, yet the police told SB that it was turned off within a mile of their home, seem to make more sense. Just because set ups are not something that successfully happen very often, doesn't exclude it as a possibility. Test drives that lead to murder happen even less often, but plenty of people are ready to believe that is a strong possibility. If part of the evidence that the police haven't yet disclosed are, say, communications between DM and MS prior to the murder and after, about buying a used truck, will that that exonerate him, in your opinion, if it shows that they didn't even plan to steal a truck?
If one person can plan a murder over a truck, couldn't another just as easily plan one to frame someone? People hate others enough to kill them all the time, but what if you hated someone so much that you thought that killing them was too good for them, what if you wanted someone to suffer for the rest of their lives instead, wouldn't a life sentence in jail for a crime they didn't commit be a better revenge, especially on someone who has enjoyed more freedom than most people can afford to? To me that scenario makes far more logical sense than someone who has an extensive collection of expensive vehicles murdering someone for a lemon of a used truck. I am sure a lot of men felt jealous of DM's looks, money, youth and lifestyle, and that could be in part why so many are so quick to convict him without ever even hearing his version of events. And the more that I think about it, BQ's idea of a jealous suitor who was rejected in favour of DM would still make a more plausible reason to murder than over a used vehicle that appears to be worth less than the many others he already owns. But that is just my opinion, again, I would love to hear opinions about why a frame up job doesn't fit the evidence so far, other than the one we've already heard that it would be difficult to successfully plan. Many things are difficult to plan, and yet occur regardless. And again, please take into account that it is possible that any evidence of the framer could have been obliterated by the burning of the corpse and the removal of the seats and the wearing of gloves...