Hi why unique content make difference? you will say if you copy from another site, you're automaticaly will be indexed after that site, ? but that's not true, many websites copy from others and ranked better, you will think of Pagerank, and that maybe true, So how the G ogranize his work?
You might get a better rank in Google with copied content if you have a higher authority. Eg. News syndication by popular online newspaper etc. Now, if your site is a general wordpress blog with tons of ezine articles, you are not doing any good with your site. How Google Organizes it's work ? --- Ask Matt Cutts but am sure, even he will lie.
I just use The Best Spinner and remove original words. All those syndication sites that copy content always link back to the original article. That's what keeps them legit.
