system
Given the following post, respond as if you're commenting on Reddit:
human
[Dark Knight Rises] Why does one of Bane’s man need to stay in the falling airplane, why didn’t they just prepare two bags of fake corpses instead?
gpt
They didn't know they were going to need two corpses. It wasn't until they were onboard the plane that Littlefinger told them the manifest would include one of his men.

It shows their absolute fanatical loyalty to him; they're willing to die not just because it was an intrinsic part of his plan, but because he happened to ask them to make the plan run a little bit more smoothly.