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You can't point to a few authors and say, just because their numbers differ, that the statistics for the industry as a whole are wrong. Unless every author experienced the changes in sales in exactly the same way (highly unlikely), then you would expect that some did well and some did poorly. It's the distribution that matters statistically, not how any particular author did. Likewise, you can't use the distribution to predict precisely how any particular author will do. All you can do is make broad statements about the industry as a whole. So, pointing to a few authors proves nothing. Pointing to a sample of 10,000 authors is much more telling. This is all basic statistics.
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