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You forgot to underline "this is most likely".
IMHO, it means :
A : they have no idea
B : there are different quality of Pearl screen, like for a lot of components, but eInk's tolerance is a bit too high, and people can actually see differences between 2 theorically identic screen.
A lot of people have also said they feel Kindle 4's screen is better than Kindle's 3. I have both and feel Kindle 4 is slightly better. Someone actually measured both screen, and found whites are almost identical, but blacks were better on Kindle 4 so it had a better contrast. Maybe with a different Kindle 3, and a different Kindle 4 he would observe a better screen on the Kindle 3. I had before a PRS 650, PRS 350 which had (to my eyes identical screen), and a PRS 950 which showed a grayer background. From all of this I conclude either EInk's tolerance on screen manufacturing is a bit too high, or maybe there are parameters proper to each device which can impact the rendering.
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