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There are also some other similarities of note between Nov/Dec and now:
-- Each day more and more pages are going supplemental
-- The size of the index is fluctuating widely, more than normal
-- Site command glitch(s)
So, Google liked the pages pre Nov/Dec. Then decided they didn't like them for a couple months. Then MC makes a comment that pages are/will be slowly returning from the supplemental index, which they did, so Google likes them again. Now, Google decides they don't like them again?
This odd behavior combined with all the other "issues" described in several threads here on WebmasterWorld sure makes you wonder what exactly is going on with Google these days.
IMHO, there are only two reasons for what is/has been happening:
Google is completely revamping is index/algo/ranking/TBPR/backlinks...in anticipation of implementing the new ranking technologies and patents we have been hearing so much about.
Google has tinkered with too many knobs at once and has basically screwed up everything and is desperately trying to get things back on track.