I don't think MS was exactly scared of DM. Remember, he was there for the test drive so he knew that the plan was to steal the truck. Furthermore, they were armed with a weapon. Under section 344 (1) of the Criminal Code, a person found guilty of armed robbery will serve a minimum of five years in prison. So, if they let him go they still would have served time in prison. The goal of the Defence is to raise "reasonable doubt". So far, we cannot "reasonably" say that he was not there at the time of the other test drive because his defence has submitted that he was. Maybe, we can say he was not there the night of the murder. However, if we make that argument then we still have to explain why his cellphone was in the general area that night. Let's say, DM stole his cellphone. Then, we still have to explain what he was doing with DM that night on the video with the incinerator? How did he get to the hangar? Who would have driven him there? He didn't have a car of his own, so it is almost near certain that DM drove him there and he was in the car with him when they went to commit the robbery. It is highly improbable that MS, just walked into DM with an incinerator and just decided to help him clean up. Also, why did he text his girlfriend that the owner of the truck is "gone, gone, gone". If it was him that texted her, that means there is no chance that DM stole his phone. Then, there is the issue of the two cars. How does one person drive two cars, they don't. So, there were two people. Why did they drive right away to the hangar, if they were just planning to rob the car? Unless, they were planning to kill him and so driving to the hangar makes sense. The only saving grace I can see for MS is lack of physical evidence, but the circumstantial evidence is very, very strong. I think it is important to note that the doubt that the defence raises has to be reasonable, they cannot just say whatever they want and then claim that it happened the way they said it did. So it seems to me, first degree murder is the reasonable charge.
IMO