Won't shock me if Cubs trade Castro this off-season but makes a lot more sense to see if he can return to his previous offensive form---and trade him next off-season.
Granted, his current trade value goes down next year if he repeats his 2013 season, but I think a lot more likely that he has a much better offensive season in 2014 and is a hot commodity again.
My guess is that Castro will always be somewhat mentally challenged on the field, so I don't want to see him blocking Baez at SS or having to move either to 2B. Just a waste of value to move a legit SS to another position at such a young age.
Replacing Barney with NL average 2B offense would be a big upgrade. Cubs 2B OPS (.572) was lowest in majors (only Toronto was below .600) and a whopping .137 points below NL average at the position (.709). So, I could see pursuing Infante. But, Rickie Weeks at 2B--after watching Barney field the position--will cause many of us to jump off a high bridge. I'm against it.
Nor do I see the point of trading for someone like Dexter Fowler. Fowler is a similar player to Denard Span and Nats had to trade a premier pitching prospect ( a top #40-60 range overall prospect) to get Span. Not worth it with Almora on the way in a year or two, seems to me.
As far as position players go this off-season, I'd be interested in a right-handed hitting corner OFer with some pop. (No, not Alfonso Soriano--younger). As things now stand, 2014 outfield looks awful and, other than Soler, Cubs not really loaded with corner OF types (assuming Bryant can stay at 3B).