zetsu kills all
1. Obito and Zetsu
2. Nagato and Konan
3. Itachi and Kisame
4. Sasori and Deidara
5. Hidan and Kakuzu
But if it's at the time of them being in Akatsuki then:
1. Pein and Konan
2. Itachi and Kisame
3. Tobi and Zetsu
4. Sasori and Deidara
5. Hidan and Kakuzu