Is Boko Haram's Abubakar Shekau dead? And what about Ayman al-Zawahiri?

Speculations about his death were hugely exaggerated in the past, but it seems that the leader of Nigerian terrorist group Boko Haram Abubakar Shekau is  really dead. What does it mean for the organization that it's known for its brutality? Will the possible collapse of Boko Haram strengthen a rival group The Islamic State West African Province (ISWAP)? And BTW, if Shekau is finally dead, what about the persistent rumors that the leader of Al-Qaeda Ayman al-Zawahiri has also died? I have tried to unwrap those issues when talking to Daveed Gartenstein-Ross, a founder and chief executive officer of Valens Global and the author of Bin Laden's Legacy, the book I can only recommend. Listen to our conversation.