This won't be a popular post, but...
'This was a premeditated mission' - I understood there to be evidence that there was a mission planned for the two men to steal a truck as has been testified to by a few witnesses, and by DM trying to get a witness to change what he heard DM say ahead of time in regard to stealing a truck at that time. For me personally, I am also satisfied that there is evidence beyond a reasonable doubt that DM (and possibly CN) knew that a murder was in the plan, because of DM's advance planning to have first the car-hauler trailer available, and then also the Yukon for towing the incinerator, as well as asking his employee in advance about the location of the generator for the incinerator. What evidence is being relied upon which proves beyond a reasonable doubt that MS knew that the mission also included murdering the truck owner?
'The mission ended with TB being dead' - This is a fact, but what evidence is being relied upon which proves beyond a reasonable doubt that killing TB was part of the plan, and what evidence is being relied upon which proves beyond a reasonable doubt that MS knew this part of the plan?
'Both knew the gun existed, and it didn't exist for just photo ops' - What evidence is being relied upon which proves beyond a reasonable doubt that both knowing the gun existed means the same thing as both knowing that it was brought along on that evening and further, that it was brought along for the purpose of carrying out a plan to kill a man that night? What proves beyond a reasonable doubt that MS knew it was present that night before the murder, and that MS also knew that it had been planned to use it to murder a man on this occasion?