From the opening scene in the Dark Knight Rises we learn that Bane and two other members of the League of Shadows get in the plane. The CIA agent tells them that his flight plan includes only one of them. Then he starts interrogating them, near the plane's open door. The one who talks first gets a ticket in the plane, but Bane calls him on his bluff (why shoot someone you're just going to throw from a plane?)
After the League of Shadows attack, when they are leaving the plane Bane asks one guy to stay
No! They expect one of us in the wreckage, brother.
Bane obviously knew the CIA agent was bluffing, and even if not, after his mask was taken off he must have seen that the three League of Shadows members are still on board (as a LoS member, I'm pretty sure Bane has learned to mind his surroundings). So, the flight plan must, or could have, included three other unexpected guys, not just one. If the flight plan had included the three, the absence of two bodies could have told authorities much more than having two extra ones...
Why then ask only one guy to stay? Why not ask three and play it safe?