This is a great article, imo. http://www.fangraphs.com/community/the-unique-path-to-success-in-oakland/ It talks about where the best teams recently (and WS champions for some time now) have built their rosters. The A's are taking a path few teams have taken, and almost none have won the WS with. There are a lot of numbers, and words, but the last few paragraphs sum up the thoughts. Basically, the A's are not reliant on the draft at all (built through picking up DFA, trades, some FA, and other routes than the draft) for their current roster. Up until the last three years, WS champions have largely been built by FA. The A's are not, and that makes their recent success so interesting (to some). Recommend the article.