Wasn't me who said it, but I doubt Polanco will be better than Tulo over the next three years. Polanco is a good hitter, but not near as good as Tulowitzki while I also doubt he will ever put up a season even close to anything Tulowitzki has. Plus he still has to go through the stage of proving himself in the majors. I only have the minor league reports to go off of, but it doesn't sound like he is as good of a defender either. Tulowitzki is a major upgrade over anyone we have.