Julian Assange may be a bit cocky, but keep in mind that a lot of this "Cult of Assange" shit and a lot of the infighting reports came from Daniel Domscheit-Berg, a person of VERY questionable motives and honesty--to say the least. His dubious book is the source of many of these reports.
Now personally, I've always strongly suspected that Domscheit-Berg was an intelligence plant at Wikileaks (working for the CIA, BND, or take your pick). He started to physically sabotage the organization pretty much from day one, acted a lot like an agent provocateur when he was there, destroyed some 3,500 unpublished whistleblower communications as he was leaving, immediately went on a campaign to discredit Wikileaks and Assange after he left, and then unsuccessfully tried to set up a leaks site himself that sounded suspiciously like a honeypot to me (send us your leaked documents and trust us to maybe release them to the press--or maybe just send some FBI agents to kick down your door). And apparently Assange suspected this too.