"'The presence of al-Qaida in Iran is a sort of a chip that the Iranians have,' said Edmund Fitton-Brown, a former senior United Nations counterterrorism official who is now an adviser to the nonprofit Counter Extremism Project.

'They're not entirely sure how or when they might play it but … it was something that they considered to have potential value,' Fitton-Brown told VOA, adding that al-Adel running the terror group from Tehran is 'not that big a change from what the situation was before Zawahiri was killed.'

'Al-Qaida has always been a consultative organization,' he said. 'They have a Shura, a leadership, and Saif was already part of it. He was already a very important voice in that leadership. He's now a more important voice in that leadership.'"