The Bad Octopus (BO) is the center of mass of Sin.It uses gravity to sustain the shell.
On the other hand BO was created autonomous.Which is a smart move because when a person pay a thief to steal he makes sure that the thief stay quiet.Also,it wouldnīt be too smart to make the dreams stay because people would be suspicious.Yevon purposefully stopped the summons with his music.
And I know he is human.That is why I donīt believe he is the BO.