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Judge DredI believe that the grading companies look at all aspects of the card:
surface
corners
edges
image (contrast, clarity, etc)
An Old Judge with a light image can potentially grade high if the corners are sharp, the surface is clean and the back is clean.
My guess is if this board had to decide the criteria to grade an Old Judge the main consideration would be to the image quality first.
There are people that consider the backs minimally important. If this were the case there would be a lot of higher grade OJ cards.