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CainIV - 5:32 pm on May 27, 2006 (gmt 0)
That wouldnt necessarily work either, as there could be technical spidering issues with a site that writes original content, and another scraper site with pr8 links pointed at the sitemap page in order to get new articles indexed faster. Then Google would falsely determine articles and content to belong to the wrong site. Relying on spiders to make judgement on what content belongs to who is faulty.
As I have said many times, there is only one way to determine which of two pages is genuine and which is a copy - that is to use the first-spidered date.