Simple
1.You are doing the securicar mission 2.Someone else comes to you in order to cooperate in the mission and get gray 3. Here the driver must have the option to reject his request to join or accept it WHY? 4. Because from now on the gaining will split into two equal parts, not one getting almost 99 percent and the other nothing, while he could die defending the truck for u
So if you are okay with taking risks /reject people's request and go alone and keep all the cash
If not the /accept the request and share the income 50 50