Should the Cubs extend Starlin Castro’s contract?

I’m mostly curious to see how much you guys think Starlin Castro is worth over the remaining 4 years of club control. There are two polls below. The first one is a simple yes/no question. If you answer no to the first one, do nothing else. If you answer yes, please answer the second poll. I’m going to assume the Cubs not only buy out his pre-free agency years, but also buy out one additional year. This means a 5-year contract.