Solving "Page Not Ranked" mystery

Verifying hypothesis

[whizkid]

Currently I have been able to see three different kinds of messages accompanying an empty Google Toolbar (v.1.162):
1. Current Page is not Ranked by Google
2. Display Google's Ranking of the Current Page
3. PageRank is Google's measure of the importance of this page (0/10)

(I have not been able to see a gray bar yet.)

1. is the default for pages which have not been indexed.
But there are indexed pages with this message too.
I have two hypothesis.
a. New pages need a minimum number of outbound links to get a PR.
b. New pages are not able (sometimes) to get ranked in only one PR algorithm iteration. (I have heard of pages with a PR in the first iteration however.)
I know for sure pages do not need to have backward links to get a PR.

2. This seems to be a message for updated pages which previously had a "Not Ranked" message.

3. PR 0/10. I have seen this measure in root directories of pages without backard links, when the directory doesn't have any links either. (No evidence that these pages might have been "penalized")

Any comments on my hypothesis?

[ciml]

Welcome to WebmasterWorld [webmasterworld.com], whizkid.

Are the "Current Page is not Ranked by Google" pages 'Fresh' inclusions? That's the only time I've seen it. This would have the same affect as the "pages are not able (sometimes) to get ranked" idea.

PR0 is very common for pages that don't have backlinks. Either the page was submitted rather than crawled, the backlinks have been removed (or are no longer crawled), or the backlink is from a low PR1 or PR0 page.