Honest question, Brock: Why do you put so much stock into WAR as an assessment of value when you've clearly demonstrated in the past that you have little faith in UZR and other defensive metrics? I agree with what you're saying but the way you've presented this argument isn't very compelling to me. Anyway, like others have pointed out, no one is claiming that Revere is going to be able to replace Span without the offense missing a beat. But the Twins have outfield depth that is only likely to grow going forward, and they have significant needs elsewhere. At this point, Span is probably their most valuable trading chip (outside of maybe Willingham but he's just not going anywhere). Revere is, at worst, a decent placeholder. Also, Shane, why you assuming that Revere is what he is at this point? He's 24, in his second big-league season, and he showed significant improvement from Year 1 to Year 2. When Span was his age, he was just finally figuring things out in Triple-A. As I mentioned to USAChief, I used WAR because it's an easy way to compare pitchers and positional players and gauge their value, even if it isn't perfect over partial seasons (if at all). When putting together that hypothetical situation, I was demonstrating how bigger gains can be had by replacing a guy like Walters with Pitcher X than the drop-off you'd see from Revere replacing Span. WAR was the easiest way to do that without going into complex math and confusing the hell out of everyone (including myself). In the end, all I was saying is "Pitcher X - Walters >> Revere - Span". FWIW, I think WAR is overrating Span this season and underrating Revere so the net loss is even lower than the numbers I used in my original post.