Christian Petersen/Getty ImagesJuan Rivera (15)The setup: Rivera was sent to Toronto by the Angels on January 21 in their infamous Vernon Wells deal, after OPSing .721 in 2010 with 15 homers in 124 games. As a Blue Jay, Rivera turned in a career-low .666 OPS (79 OPS+) in 70 games. On July 4, a day after he turned 33, Toronto designated Rivera for assignment. Eight days later, the Dodgers acquired Rivera in exchange for future considerations, cutting bait on Marcus Thames in the process. In one of my less prescient analyses of the year, I was almost completely dismissive of the pickup.The closeup: In 2006, Marlon Anderson. In 2009, Ronnie Belliard. In 2010, Rod Barajas. In 2011, Rivera. Once again, Ned Colletti found one of his greatest successes of the year in giving up next to nothing to