Originally Posted by Danny Serafini
Juan Castro really has nothing to do with signing Alex Gonzalez. Castro's here as a backup, period. Having a good fielding starting SS doesn't mean you don't need your backup to be able to field. One move has no effect on the other.
I'd suggest he's a backup because the Reds don't really think he's all that good with the glove when push comes to shove. I think Kc's right that Castro's probably seen more as a 3B defensive replacement than a SS by the organization.
Because if the Reds really thought he was a quality defensive SS then Gonzalez would be redundant. In other words, Castro's deficits have plenty of effect on why the team would pursue a guy like Gonzalez. He'd be brought in to do what Castro can't, give the team some top tier defense at SS.
RMR, I assume the balance point is where the positive of your fielding runs above average exceeds the negative of your runs created below position. From what I can tell, Gonzalez's glove has done more good than his bat has harm in recent years, making him a net positive. Though I think the Reds might also be well-served to look at a move like this from a holistic team standpoint. The club has played particularly poor defense in recent years and getting a high quality SS and CF are the two quickest ways to address that condition.