plc90210 - 11:14 pm on Apr 7, 2013 (gmt 0)
"how would scraper sites that are only a few weeks/months old duplicate content from originators which have been registered and ranking highly for years ever out rank them within months, weeks and sometimes even days?"
301 redirects from aged domains.
I once came across a website that was ranking on the first page for a highly competitive keyword and the domain was only registered 3 days ago... Turned out it had a 301 redirect from a PR7 website that was 5+ years old.