Michael Smith II, a terrorism analyst at Johns Hopkins University's Global Security Studies program, worried that the killing of al-Baghdadi by the U.S. military might function as a recruitment tool for the IS.

Javed Ali, a former senior director for counterterrorism at the National Security Council, noted that the death of Baghdadi would not lead to a strategic defeat of the IS, which has proved resilient despite its physical loss.

"That's something we learned in the aftermath of the bin Laden raid," he said.

Jennifer Cafarella, research director at the Institute for the study of War in Washington, also referred to the case of Osama bin Laden. She told The New York Times that al-Qaeda continued to expand globally even after the U.S. military killed the founder and former leader of the terrorist group in 2011.

"Unfortunately, killing leaders does not defeat terrorist organizations," Cafarella said.

Hassan Hassan, a Middle East expert based at the Center for Global Policy, shared a similar view. He predicted that the IS would maintain its foreign affiliates largely intact, and the IS groups in Iraq and Syria would not be demoralized but instead reinvigorated.

James Jeffrey, U.S. special envoy for Syria and the anti-ISIS (the Islamic State) coalition, acknowledged during a congressional hearing last week that more than 100 IS detainees had escaped in north Syria, where the Turkish military operations against the Syrian Kurdish forces took place recently.

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