Abu Muhammad al-Jolani, the man of mystery, is no longer just a name whispered among terrorists and warlords. He has become a key player in the shifting sands of Syria's war; a figure who could very well shape the country’s future. He is a man who plays his cards close to his chest. He never lets his guard down. We know very little about his early years, he’s a ghost in the system. Even his true identity remains a puzzle. NDTV's Arjun Samar Mahendran brings this report.