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rags ...

      A sensor site has to have at least three sensor elements to detect three
      colors.




I'm not sure if I understand the nature of your question-- but that's certainly not the case if the colors have been interpolated over a wider grid.

in a Bayer mosaic each sensor site records luminance only. raw files are really gray scale data. each sensor also has a color filter associated with it. to my understanding--the characteristics of this color array in conjunction with the recorded luminescence provides the raw data that's needed for ACR to interpolate and transformed the information into an 8 or 16 bit RGB file.

so, for example, from a simple pixel grid of four sensors --RGBG-- the luminance in conjunction with the known arrangement of these colors produces a set of values that when compared with its nearest neighbours can make a reasonably accurate stab at interpolating the color values over the picture grid.

a conversion program needs to know the characteristics of the pixel grid to successfully demosaic the raw data into a complete RGB image.

hope this has somewhat helped.