There is no good leader, that's why there's so much conflict and no orginisation. It's as if the producers have done it on purpose.
I'd prefer to say who's the most
prominent leader. That would be Chanelle, in my opinion. chanelle's skills of manipulation have found her in the strongest position in the house at the moment, she pulls Ziggy's strings to suit her motives and ziggy's powers of manipulation (which are clearly evident) are paling in comparison next to his 'partner'. They're a formidable political couple, that much is clear, they have the trust and devotion of at least 5 other housemates (Sam, Amanda, Gerry, Liam, Carole) who don't question
anything they do, no matter how despicable (bullying Charley and screaming "psycho!" at her, because they were angry she got out of nomination), and other housemates recognise their authority but realised early in the competition to avoid rebelling against it (Nicky, Laura) probably to retain peace of mind, if anything.
I'd say Chanelle is a bureaucratic leader, her dreams of fame and fortune drive her to take up the position and the rest of the groups interests don't even factor in her intentions, which in my opinion isn't
good for the group, but it's certainly good for her.