Every off-season you see the same type of analysis when it comes to evaluating how a team has improved for the following season. It's always a basic formula that subtracts the players who are leaving from the end of the season roster, and adds in only the players who project to be on the 25-man roster on Opening Day the following year. And the whole process is wrong.

The Pirates saw A.J. Burnett, Marlon Byrd, Justin Morneau, Garrett Jones, Clint Barmes and others walk as free agents at the end of the season. Byrd, Morneau, and Jones have signed elsewhere. Barmes just re-signed with the Pirates today. Burnett is still in limbo, deciding whether he will retire.

The Pirates have added Edinson Volquez, Chris Stewart, Jaff Decker, and Miles Mikolas so far this off-season. And you can add ...

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