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If I have a PR5 site and I link to a new site of mine and it gets a PR4, I can assume it passes PR (provided the PR5 is the only link). What other ways are there to verify a site can pass PR, specifically a site not owned by me where I can do experimentation?
It might have to do with the idea that toolbar pr and page cached don't update together. A page that is "neglected," i.e. not updated and loses internal links, can be dropped and the toolbar pr update lags for months.
When I noticed a links page was not in cache, I suspected either
(1)some form of cloaking,
(2)neglect,
(3)google cache fluke.
To test this, I linked directly to the page in question to get the bot to visit. It was cached soon and I could then verify they were not cloaking. It appears the page had been neglected. Most of the site had pages well connected with the pr source pages, except for the links pages (dozens of them), which were nearly orphaned. They had one "showcase" links page that potential link partners could find easily from home page, but actually place your link on the buried links pages that rarely get visits.
Now, I just make it a practice to link directly back to partner links pages that have old cache, then remove second link when cache is updated.