Every group, whether social or at work, has a hierarchy of some sort.
Someone will suggest something and everyone else will go along with it, whether they agree or not. But if someone else had said it, others would have voiced their disapproval.
So what is the order in BB10?
I'd say:
Marcus & Siavash
Lisa & Noirin
Charlie
Kris, Sophie, Karly, Rodrigo
Sree, Freddie, Angel
Marcus has his position because he's that bit older, but also able to relate to the younger ones. Unlike previous older HM's, he stays up late. He's a big presence physically and is commanding and authoritative.
Siavash is measured and thoughtful with a fantastic sense of humour. Less obvious than Marcus, but I think he has the ears of many of his fellow HM's. Losing Cairon will be a blow to him, though.
Lisa wants to be one of the big dogs, but I think she's been neutered by BB.
I have underlined Noirin because she is the most important person in that house. She has the vast majority of them wrapped around her finger. She seems like a clever girl, pretty, quite funny and well liked in the house. Also she is getting on well with Siavash and Marcus who are currently the most "powerful" in the house.
She is the darkhorse to win.
Charlie is slightly above the others because I see him as the leader of the bromance between him and Kris.
Below Charlie you have the "quiet ones" who are quite well respected, but not influential.
The bottom 3 unfortunately are seen as a joke in the house and are the "rejects". They're the eccentric characters which the majority of the group can't take seriously. They are inevitably going to be nominated this week.