What the Pho
Un-named member>Pein>All of Akatsuki>Itachi.
except that Itachi listens to Pein. He and Sasori wanted to rip each other's heart's out. Pein told them to both sit down and shut up, and they listened, right away. Obviously this man is the s**t.
Also, i very much doubt that Itachi could have taken the other 8 members of the Akatsuki, seeing as I'm pretty sure Sasori was at a similar level on his own, as he was not scared of Itachi.