Prominent Isis leader Abu Mohamed al-Adnani is "eminently replaceable", according to terrorism expert Dr. Azfal Ashraf.
The jihadist was killed by a US drone strike today, according to a statement from Isis. He had been monitoring military operations in Aleppo.
Al-Adnani was one of Isis' longest-serving figures and personally oversaw and directed its external operations.
He notably served as the 'voice of Isis', releasing several lengthy audio files online in which he urged followers to carry out attacks - even during times such as the Muslim holy month of Ramadan.
Dr. Ashraf, who works as a consultant fellow for the Royal United Services Institute (RUSI), said his death will be a blow to Isis, but not a major setback for the terrorist group.
"It's significant in that he was a recognised name, face and voice," he told Julia Hartley-Brewer. "But it will only be significant if the success is sustained.
"He's eminently replaceable, and in fact, there are reports he already has been replaced. There is nothing particularly talented about him which can't be replaced or improved on by his successors.
"There's a great deal of hype about his achievements. In reality, most of what he's done has been done in the past, he's just taken a genre of violence forward."