There's no doubt that the GB are firmly in charge.
Chapter 1, Page 5.
Point 3. "While the Governing Body delegates certain details or responsibilities to committees made up of its own members, to committees made up of other dedicated servants of God, or to instruments such as corporations and legal agencies, the Governing Body always takes the lead in promoting the smooth functioning of the organisation and the unity of all of Gods people".
Point 4. The Governing Body gives final approval for new publications as well as new audio and video programs.
Point 6. [...] The Governing Body has the prerogative to use its discretion and look into any matters it deems necessary to examine with regard to the Kingdom work.
EDIT to Add : ThomasCovenant spotted the same!!