I agree and OK, imo it's time to play devil's advocate here before we totally descend into webstalking instead of websleuthing... and given that we're told by LE that other suspects remain at large...let me toss this alternative explanation into the ring.
First, let's acknowledge that our primary purpose was to either find, or find out what happened to TB, and who was responsible for his disappearance. If the purpose of the thread has now changed to digging up as much dirt on an accused man's social and business life and that of his family, based on rumour, provocative hearsay, and unsubstantiated reports, then, what the hay, let's go for it. Why stop with DM? There are plenty of people associated with the case we can trash all over the net - from police to reporters to, I dunno, how about these guys....? ( Courtesy of the CBC, it's just a couple of DM's gentleman farmer neighbors out snapping pics of the farm on a pleasant afternoon? Oooooky dooky?)
http://cbc.ca/kitchener-waterloo/features/millard-farm/images/43.34825,%20-80.43556.jpg
So with that, let me throw this monkey wrench into the works. What if DM really was looking to buy a black 2007 Dodge Ram 3500 diesel pickup? Didn't like the one he saw on Sunday. Took TB's out for a test drive Monday night. Busy. Couldn't get away earlier. Opened 'er up on the highway on a drive it up to Brantford. BOUGHT IT with cash on the spot, an approach that characterizes most of his purchases. He has a busy day tomorrow finalizing a real estate deal, etc, and it's already late so, as planned, he leaves in the other vehicle (the one "following") to go home while giving instructions to the other guys to take the truck up to the hangar and leave it there. In other words, what if he left the scene before any of the violence took place?
What could have happened next in that scenario was the successful robbery of TB of the 25 grand in a tussle that led to his death and then the vehicle's delivery to the hangar to effectively pin the death on DM.
Maybe "follow the money" in this case is as simple as that. OOM (and challenges welcome)