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It seems that the Ink algo boosts pages on domains that have a high link popularity. For example, if there is one page optimized for "widgets" on a site that has nothing to do with widgets, it will still rank well if that domain has a high link popularity - even if the "widgets" page has no backlinks from external sites. This is the only explanation I can find for some very irrelevant results.
It also seems that your link popularity is calculated by the number of different domains linking to your domain. So if there are ten pages on widgets.com linking to your site it only counts as one point. While this makes sense to stop link spam, it puts new sites at a disadvantage as it takes time to build a wide base of links to your site (and even longer for Ink to index them all).