Castro's arm is way too strong to be playing second base plus the Cubs have a Gold Glove second baseman. Most things I have been hearing and reading talk about moving him to third when the time comes. Plus, Castro will begin to hit for more power in the near future and will be able to handle the offensive demands of playing third base. I don't know that Vitters is going to cut it.
Regardless, I'm ready for Opening Day on Monday.
That's exactly why I think Barney gets traded at some point. His value will never be higher just coming off a Gold Glove 2012.
But Baez is a year or so away. We'll cross that bridge when we get there. What worries me about Castro at 3B is his inconsistent defense, especially with throws. He struggles making throws from SS at times, but it's not for lack of armstrength.
The Cubs do have a black hole at third right now, so I guess it could be far, far worse (like, right now) than having Castro at third.