LOS ANGELES -- If you suspect that Dan Haren won't bounce back or that Josh Beckett and Chad Billingsley won't regain their arm strength after surgery, you could argue that starting pitching depth is one of the Dodgers' weaknesses heading into spring training.Beyond Clayton Kershaw, Zack Greinke and Hyun-Jin Ryu, you find a long series of question marks.And if you happened to represent one of the many free agent pitchers who remain unsigned, you might be compelled by this information to call Dodgers general manager Ned Colletti.