As I said, you can output 4:4:4 color from a Pixelvision camera, but it will still be black and white.
True 4:4:4 color requires that you can capture the actual red, green and blue values for every pixel, which requires that your CCDs have at least as high a resolution as the output signal. Claiming to produce 4:4:4 color at HD resolutions when you have SD pixels is silly... as you demonstrated yourself, you have blocks of four pixels with the same red, green or blue value: the fact that one of those changes in each pixel gives you somewhat higher resolution, but doesn't give you anything like true 4:4:4 color even if you're recording the red, green and blue values of each pixel.
True 4:4:4 color requires that you can capture the actual red, green and blue values for every pixel, which requires that your CCDs have at least as high a resolution as the output signal. Claiming to produce 4:4:4 color at HD resolutions when you have SD pixels is silly... as you demonstrated yourself, you have blocks of four pixels with the same red, green or blue value: the fact that one of those changes in each pixel gives you somewhat higher resolution, but doesn't give you anything like true 4:4:4 color even if you're recording the red, green and blue values of each pixel.