In the Old man scenario its impossible to get the insurgent ending. When the player goes to George town to drop of the counter agent in the blue van. The current task wont finish after leaving the counter agent in the box. Some people have said that it can still be completed by simply leaving the map boarder. This has not worked out for me. I have restarted the mission 3 times hopping a restart would fix the issue. I have also tried verifying my game files as well as playing without any mods.