The newly-appointed commander of the Quds Force of the Islamic Revolutionary Guard Corps Esmail Qaani attending a mourning ceremony held in Tehran for slain top general Qassem Suleimani. AFP
The newly-appointed commander of the Quds Force of the Islamic Revolutionary Guard Corps Esmail Qaani attending a mourning ceremony held in Tehran for slain top general Qassem Suleimani. AFP

Why Iran's Quds Force chose Esmail Qaani as Suleimani's successor