At this writing, Astros outfield prospect Domingo Santana is batting .297/.374/.493 as a 21-year-old in Triple-A. That good production comes after a 2013 campaign in which he slugged .498 with 25 homers as a 20-year-old in Double-A. In other words, Santana is becoming a potentially important part of Houston's rebuild. The Astros acquired Santana as part of the 2011 trade in which they sent Hunter Pence to the Phillies. Houston also landed Jon Singleton and Jarred Cosart in that same deal. So it's turning out being pretty costly for the Phils and GM Ruben Amaro. Why are we talking about this trade almost three years later? Well, here's this most interesting recent nugget from Jose de Jesus Ortiz of the Houston Chronicle ... Less than two months after they picked George Springer from the University of Connecticut, the Astros sent Pence and cash to the Phillies on July 29, 2011, for Cosart, Singleton, Zeid and a player to be named, which ended up being Santana. In spring training, a Phillies official admitted that Santana wasn't actually supposed to be on the list that was given to the Astros to pick from to satisfy the final piece on Aug. 15, 2011.