Polanco is making more errors that Santana, and does not have the arm. A lot of Santana's errors were early on, that seems to have settled down. More range than EE, and still upside. It took Dozier and Plouffe several YEARS to become competent, or has that been forgotten. If you can't vastly improve a position you need to look at how much a certain player will improve. Escobar will not get any better, Nunez is not a glove man, and two weeks of Polanco at SS would make everyone wish Santana was back. You should not employ a SS to make up for the lack of offense your corner guys, aren't providing. Good grief, there were people calling for Buxton to be demoted after a week. BTW, whomever is the SS, I want a very good fielding SS who might hit a little, vs a good hitter, who can play SS a little.