"“That would create some kind of uproar within the community of supporters and sympathisers of IS,” said Hans-Jakob Schindler, director of the Counter-Extremism Project (CEP) think tank.

In theory, the caliph has to be an Arab from a tribe linked to the prophet. The supreme leader of a group so concerned with its ideological foundations “cannot be just any Somali with an orange beard,” Schindler told AFP."