In S2, Jeff was narrator for Kucha... didn't help him at all after the merge.MB will pick his narrator based on what he wants his audience to see at that time... for example, I think right now he wants us to believe that Clarence is forgiven and fits in with his tribe. Hence, Clarence is the narrator... but I do not believe that Clarence will survive at all once he's no longer needed for strength challenges.
Similarly, Kim P. narrates because the audience needs some connection to understand the GXA, and she's the most amicable of the GXA.
These two are the narrators for Boran and Samburu, and will no longer be needed when these tribes cease to exist... with the twist coming up next week, they may have served their purpose by then.
Definately, they will no longer be needed at the merge.
You never know what might be up my sleeeve...