Sorry its late, wanted to respond but, I believe that your answer was in the final afternoon video from LE where they took questions from the Media, they specifically answered a lot of the "timeline" questions.
The video, I posted it about 2-3 pages back OR you can click on my name and get the post through that means as well. Apologies but, I am just about outa steam for the night.
My "thoughts" are that they had to "improvise" after having to kill TB in the truck, honestly, I don't think that was the plan.. as LE has stated, there was a "struggle" in the vehicle. That tells me there was something they found, maybe dents or scuffs that were obvious once they retrieved the truck from the mom's driveway.
DM has an employee living in Brantford.. SS
I don't think murder was planned, and this shows by the stupid moves after the fact. In their panic, they relied on certain human tendencies in a state of panic/shock.
If one is going to buy a used veh, you bring either a good friend for a second opinion or a mechanic,. They also knew what they were looking for and being picky.
The first thing that jumped at me, when the descriptions came out, was a hooded person.
What are some of the reasons to have a hood up:
A. Look cool
B. Raining/cold
C. Hide identity quickly.
Rule outs
A. Dark out, also harder to see walking down gravel road.
B. Wasn't cold or raining to warrant hood up.
C. Suspect didn't realize he knew Tb or sb, tiil the last minute and couldn't turn back. Obviously the link wasn't the truck or he risked being identified or was it the other veh, and they directly or indirectly knew tb or sb.
If the suspects id was blown, the rules all changed at that point and the id'ed suspect stupidly decided to kill him rather than calling it off. Maybe the unknown suspect blew it on the first stolen truck attempt and felt compelled to make this one worked.
That will be dm's defence as his intent was just a carjacking and the second suspect choose to kill Tb.