You are correct that you can add WAR up. The point is that you're comparing multiple players to one. If Detroit had keep Granderson, they would have used other players in the places of Schlereth, Scherzer, and Coke. So really, it's comparing the value of Granderson + 3 unknown players to the value of Jackson, Coke, Scherzer, & Schlereth. Which of those is better for Detroit.







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