here it comes:
Mace Windu:
a member of the JC. He is deeply concerned about a new disturbance in the Force. He senses darkness where others see only light.CUT: I see....
GL: In The Phantom Menace one of the Jedi Council members already knows the balance of The Force is starting to slip, and will slip further. It is obvious to this person that The Sith are going to destroy this balance. On the other hand a prediction which is referred to states someone will replace the balance in the future. At the right time a balance may again be created, but presently it is being eroded by dark forces. All of this shall be explained in Episode 2, so I can't say any more!
There are a few things here to consider. Firstly, and most obviously, Lucas says that one of the council members knows the balance is starting to slip - this confirms that someone in the council knows more than the rest of them. It makes the most sense that this council member would be either Yoda or Mace Windu, but because Windu is the only one who refers to the balance of the Force in Episode I, I think he's more likely to be the one questioning the stability of that balance.
Secondly, I think Lucas slipped in this interview and let us know more than he intended. Did anyone else catch it? He says "It is obvious to this person that the Sith are going to destroy the balance." Does the word "person" not indicate that the one who's aware of the Sith is a human? There is only one full-human on the council: Mace Windu. Lucas has never reffered to an alien as a person before, so I think he slipped a little there.
note: Adi Gallia is also fully human