Mark J. Terrill/APCorey Smith blasted a three-run home run on the final day of Spring Training against Mariners pitcher Tom Wilhelmsen.The Dodgers are expected today to make official the callup of Russ Mitchell to take the place of Casey Blake, who is suffering from an infection in his elbow. The Dodgers could have gone another way by turning to a guy you probably first heard about in Spring Training – if you heard of him at all – Corey Smith. Here's the why and why not:Why:Though he had an .898 OPS in Albuquerque last year, Mitchell only has a .281 on-base percentage and .383 slugging percentage this year.Playing first with Chattanooga and then with Albuquerque this year, Smith has a .416 on-base percentage and .993 slugging percentage with three homers, six walks and 12 s