I don't understand why you're so riled up about this, Doug.

There's blue in the JPL image. It's not as distinct as in the version I came up with, but the two images are related through brightness, contrast, and gamma--adjust those characteristics in either image and you get the other one. But the blue doesn't go away.

Another test is to split out the blue channel from the NASA image. The ground face has an average value of 121, while the next-lightest area--the highlights on the edges of the "scallops"--have an intensity of 94. NASA's image definitely shows that area as blue--almost 30% more blue than the unground rock.

NASA's also released this "enhanced color" image of the ground face:

"Enhanced color" isn't the same as "false color"--it means they've cranked up the saturation. Even NASA seems to think that there's a noticeable amount of blue (as well as green) in the underlying rock. Why are you so determined that there be no blue there?