I can not make sense of the current behavior, but it is worth mentioning:
I put a SPAM domain online - pure wild articles, plain out MFA... and it made around 1$ a day.
Then I decided that the domain name is so nice that I should use it for a branded, cool new forum. Killed the domain early November, before I went to Pubcon. All pages went to 404.
Last week I launched the forum.
Got good articles and good files to download up. Nicely made, put some efford in, around 300 pages are online now.
Started the link building.
Now, and this is the strange part of the story:
New pages are showing up, but also OLD pages that do not exist anymore AND have not been online for a few weeks. The old (bad content) was removed late October. The domain idled for around 4 weeks.
I put the new stuff there, started link building and as soon as the homepage gets some power, old and outdated pages show up...?
Hmmmm! One conclusion: Hill-top!
Google gave a damn about the old poor pages but still got them in cache. Now the main domain gains some power and G pulls out the old crap from the cache? Seriously?