Day 6: 2:00 AM - 3:00 AM - S6-E21
Continuity mistake: After Jack kills the Chinese agent, he picks up the agent's weapon (a HK G36). The weapon has a magazine in one of the camera angles but when the scene switches to another angle, there is no magazine in the rifle. (00:32:15)
Chosen answer: Nobody knew, not even the writers, until at least halfway through the season when they were writing the end. They wanted to keep all options open.
Nick N.