I see. Well— rank doesn't always have something to do with it. I'm not the only one in this group with a high rank, for instance. There's Cassian, and John. But it doesn't always work that way. Here, it's more down to who's coordinating the group, who acts as a liaison between all the members, so on.

[ And sometimes it's a matter of charisma, too. Having an impact on people. Not quite as important on a mission of this sort, though. ]