This is a real change from what Google has done in the past. No Google Guy, no Adam Lassnik and Matt Cutts doesn't seem to be addressing this in his blog.
I'm wondering if I should switch to breadcrumb navigation. Right now I usually put a link to each of the other articles in a given section. This may be as many as 15. I assumed that people visiting one page would likely be interested in the other pages in a given subtopic. With breadcrumb they have to go back to the contents page and I don't think as many people would do that. But if they see something that interests them right in the navigation they will click and visit the page. It's back to that conflict between usability for visitors or keeping Google rankings. The problem is if people can't find the articles usability doesn't matter.