Problem with letting span walk is he's the only true lead off guy and still a pretty good one and his deal is extremely reasonable. Given werth, Harper, and span tend to get banged up, keeping span, and then using taylor as a 4th OF to rotate in and keep guys fresh and ready to fill in for extended period at any of the 3 spots if needed, then the CF job is his full time in 2017 after span becomes a FA. That's what I would do. Span unquestionably makes the lineup better.