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The faders do not move. The faders establish the maximum level. Since the faders of all channels are ganged the maximum level is the same for all. The channel assigned to the DCA can be viewed as a control for the percentage of the maximum set by the fader. Turn down the DCA and the output of all channels assigned to the DCA go down by the percentage set by the DCA

I quickly set this up on my iLive using 4 matrix channels, ganged the faders, and assigned one of the four to a DCA. Assigned the signal generator to all four matrix channels. Turning down the DCA controlled the output on the matrix assigned to it. No change to the output for the other channels or any of the faders except the DCA.