Chris Humphreys/US PresswireMarcus Thames (32)The setup: Seeking to build a left fielder in Mr. Potato Head fashion, the Dodgers signed Thames in January to be the right hand of the tuber, based on the fact that he had a .350 on-base percentage and .491 slugging percentage against lefties in 2010. He was going to be 34 and had a terrible defensive reputation, but for $1 million, there was hope he could be useful at least as a bench player.The closeup: In April, Thames hit two pinch-hit home runs. That's about it for positives. As a left fielder, Thames went 8 for 42 with four walks, no home runs and a .523 OPS in a season that was crippled in May by a right quad strain that knocked him out for five weeks. Overall, Thames had a .243 on-base percentage and .333 slugging percentage when t