Quote Originally Posted by DarthEnder
I thought they said that Menos are actually made up of many Hollows merged into one being.

Also, I think only the level one Menos, the Gillians, are mindless. The Adjuchas and the Vasto Lords are shown to be intellegent.
You've got a point there. Though we haven't heard how the Adjuchas and Vasto's are 'formed', if it's something like a Menos or if they just are.