The big question, for me, is why do people follow someone into 'co-creating' a cult. It's not so much all the ways Jim Jones thought he was special, but how and why did all these other people believe he was special. So much and so special that they were willing to do anything he told them to do. Why didn't they refuse to drink the kool-aid, and gang up on him and his handful of enforcers, and fight for their lives and the lives of their friends and children, even if it meant dying in the process - since they were clearly going to die anyway?'
IMO that requires looking at the psychology/character traits/circumstances of the followers, and their relationship to the leader.
So, for eg, if Hitler had been born in England or the US, regardless of his narcissistic traits, IMO neither nation would have voted him in as their leader. They didn't need or want Hitler or his message or the Nazi party because they'd won WWI, they already had an empire, they were economically prosperous, they had a functioning democratic system. Whereas, the Germans had none of those things, but they wanted them badly, and they created a shared delusion with Hitler about how he, with their support, would deliver a glorious future for Germany, etc etc.
Also, most cult leaders have a powerful ability to speak to and stir up groups or crowds. That means displaying passion, confidence, repetition, and so forth. They understand how to stage and publish propaganda, which exists for the sole purpose of getting people worked up and supporting your cause in a dire 'us vs them' way. They have innate skills in brain washing techniques, and manipulating people in groups to give up their own money and power and walk willingly into the prison of the cult, and never to leave, even though the door is unlocked.