Know Some thing About Google Indexing Scrapers First

Yesterday I published a guest post from Abhijeet Mukherjee titled Do You Know Your Visitors? 5 Points to Consider. A couple of hours later Abhijeet messaged me on Gtalk to let me know that Google was not indexing my backlinks to his blog, but rather the link from a scraper site that had copied part of the post.
This made me curious and went to check for myself. The first thing I wanted to know was if my post was indexed already by Google or not. I copied one sentence from the post and search it in Google, with quotation marks to find only exact matches. The result was pretty surprising: Google had already indexed 2 scraper sites, but my original post was not on their index yet, as the image below illustrates:

I repeated the search query today, and my post is now showing on the first position. Regardless, I find it pretty weird that Google would index first scraping material and only afterwards the original source. The same thing was happening to the indexation of the backlinks.