tedster - 6:32 pm on Mar 6, 2010 (gmt 0) [edited by: tedster at 6:53 pm (utc) on Mar 7, 2010]
Just as if G forgott some of the incoming links for a while.
That sounds like a possibility to me. The method Google uses to build up the data-set for search results seems to involve building and then combining a number of specialized lists.
In the past, some of those lists have have had incomplete data, or at least the "mixed together" data-set only polled in some of the specialized list. When those incomplete lists get used in production, then buggy search results happen. For example, strong home pages sometimes went missing for a while and then came back.
So the idea that some backlinks were accidentally skipped during Google's earlier steps at building up a recent data-set is a very real possibility, in my opinion.
[edited by: tedster at 6:53 pm (utc) on Mar 7, 2010]