^ That's just win right there.
1. Nakamata is almost the oldest member (couple weeks younger than Oba)
2. She is smart like Team K leader Sayaka Akimoto
3. She is tiny like Team A leader Takahashi Minami
Correct me if I'm wrong, but I think Shimada's been the leader figure of the kks ever since Shiichan got promoted, so I'd expect her to be the leader of Team 4 over anyone else; they've already proven that age ain't a prerequisite for the captaincy.