Kirby Lee/Image of Sport-US PresswireJavy GuerraAll praise is due to Dodger reliever Javy Guerra, who had never pitched above Double-A before 2011 but has posted a standout rookie season.The 25-year-old has a 1.99 ERA and 18 strikeouts in 22 2/3 innings against 31 baserunners and has yet to blow a save opportunity. His perceived calm on the mound — perhaps marked by how he pitched out of a bases-loaded, none-out jam of his own making July 8 against San Diego — has led many to wonder if the Dodgers have found their replacement at closer for Jonathan Broxton, who surely will not be back in a Dodger uniform in 2012, if at all.On one level, I take issue with the question itself — the goal is always simply to find the best relievers you can and not worry about their roles. Par