I hadn't noticed this before but the Governing Body is actually saying that they only are the Faithful & Discreet Slave.
Watchtower 2009 6/15 Para 18
Similarly, today a limited number of anointed men have the responsibility of representing the slave class. They make up the Governing Body of Jehovah’s Witnesses. These spirit-anointed men oversee the Kingdom work and the spiritual feeding program. As in the first century, though, the Governing Body does not consult with each individual member of the slave class before making decisions.
The first sentence above states - 'a limited number of anointed men have the responsibility of representing the slave class'....'the Governing Body'.
This can only mean that the rest (or majority of anointed) DO NOT represent the Faithful & Discreet Slave.
The definition of represent from the free dictionary includes
5. To describe or put forward (a person or thing) as an embodiment of a specified quality.
a. To serve as the official and authorized delegate or agent for.
b. To act as a spokesperson for.
7. To serve as an example of: The museum had several paintings representing the artist's early style.
8. To be the equivalent of.
The previous paragraph in the Watchtower gives their basis for making this claim.
To illustrate: The Scriptures at times speak of “the congregation” as taking certain action in handling judicial matters. (Matt. 18:17) In real terms, though, it is only the elders who take this action in their capacity as representatives of the congregation. The elders do not contact all members of the congregation to ask their various opinions before they make a decision. Theocratically, they perform the role that they have been assigned; they act on behalf of the whole congregation.
.Matt 18:17 says " If he does not listen to them, speak to the congregation. If he does not listen even to the congregation, let him be to you just as a man of the nations and as a tax collector." The JWs must interpret this to mean that only the heads of the congregation would have been involved but don't actually say so. In the above quote they use the idea "In real terms" which is a bit obscure but could easily be viewed as - well they used the congregation back then but in reality today we would only use the elders of the congregation.
There is so little basis, if any at all, to support their position of the Governing Body over anyone.
Even if that parable of the FD & S was correctly interpreted as a prophecy it does not say there will be another class that will represent the FD & S .