Okay, here are some stats for you then...
Podsednik (career stats vs. lefties): .267 AVG / .336 OBP / .378 SLG / .713 OPS
Ozuna (career stats vs. lefties): .278 AVG / .311 OBP / .317 SLG / .628 OPS
Podsednik (2005 stats vs. lefties): .330 AVG / .404 OBP / .350 SLG / .754 OPS
Ozuna (2005 stats vs. lefties): .306 AVG / .340 OBP / .357 SLG / .697 OPS
So Ozuna WILL be a downgrade from Podsednik against a lefty starter on opening day, unlike what you said. Is that enough proof for you?