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If it's not a competitive keyword, or a phrase that's unlikely to be found elsewhere then it will rank them all. They're all indexed and they're all relevant to the query. They wouldn't all rank if other sits had that same specific word string.

PageRank is content unaware - it is solely a measurement of link popularity. The PageRank remains zero for these pages because, more likely than not, Google has simply not updated the Toolbar PR. What is the MozRank for these pages?