They needed them for clean up on the Thursday evening/night prior to loading TB's truck into the trail. IIRC LE showed up at the hangar early Friday morning. DM not being an early bird and lacking sleep didn't help him to think straight thank goodness hahaha.
So it seems that once DM got wind of AJ going to CS or LE Thursday later in the day, he was in a mad rush to get TB's truck somewhat cleaned up and the heck out of the hangar, hide the incinerator in the trees, he used CN to do all this.
WHERE WAS MS FROM TUESDAY ONWARD TO HELP DM? DM had to call upon CN to help him instead. IMO MS was staying as far away as possible from this criminal mess DM had made. MS probably only followed DM back to the farmland, and then just helped DM put TB's body in the incinerator, then following him to the hangar because it was DM's Yukon he was driving. Then waited with DM at the hangar, while the incinerator did it's thing because MS had no way of leaving, no transportation. I would imagine MS might have been in a state of shock (once DM shot TB) and just went along with DM fearing for his own life. Could that be why he took MM with him the one day to the hangar? MS figured with MM along DM wouldn't take the chance of doing anything to the two of them together? MOO.