TheMadScientist - 6:31 pm on Apr 3, 2010 (gmt 0)
Why is this happening?
Caffeine is not an algo change, so it does not 'change the rankings' by increasing the importance of one variable and decreasing the importance of another. But, Caffeine is a change to the underlying data storage system the rankings are based on, so it has a direct impact on the final results through: data, speed of calculations, storage methods, etc.
One of the things I've read speculated they have been trying to do is keep the results generated from Caffeine 'essentially the same' as they are using the Big Daddy storage system, but any change to the underlying data can, and IMO most likely will, have an impact on the rankings to some extent.
So, Caffeine doesn't change what's important (algo), but does change the underlying data storage (Big Daddy to Caffeine), so Caffeine may directly affect the rankings, but not what's important to rank. If that makes any sense at all...