Matt Wieters, Francisco Pena, and the confouding reasons they are locked in a battle for backup catcher

As the number-five overall pick in the 2007 Major League Baseball draft, Matt Wieters was burdened with extraordinary expectations from the moment he joined the Baltimore Orioles organization. According to Kevin Goldstein of Baseball Prospectus (and later of the Houston Astros), Wieters was baseball's best prospect entering 2009, ahead of future MLB aces David Price and Madison…