At baseball-ref offensive WAR = Runs above average from batting, base running, reaching on errors, avoiding DPs, positional adjustments and replacement level.Escobar: Year Age Tm Lg PA Rbat Rbaser Rroe Rdp Rfield Rpos Rrep RAR WAR oRAR oWAR dWAR 2011 24 KCR AL 437 -17 1 1 2 11 6 15 18 1.8 7 0.7 1.1So just from batting he is 17 runs below average, but when you add everything together for offense you get to 7 runs above replacement, for 0.7 oWAR. Yuni looks like this: Year Age Tm Lg PA Rbat Rbaser Rroe Rdp Rfield Rpos Rrep RAR WAR oRAR oWAR dWAR 2011 29 MIL NL 405 -10 1 -2 -1 -4 5 11 -0 0.0 4 0.4 -0.4Yuni is at 10 runs below average from batting, and comes out to 4 runs above replacement on offense, for 0.4 WAR The main differences is that Escobar gets 15 runs to Yunis 11 runs from replacement level because the AL is a stronger league so league average in the AL means you are further from replacement level than in the NL. The average NLer is worse than the average ALer. Escobar also has a little more playing time which helps because WAR is also a counting stat dependent on playing time. This is why Escobar get 6 positional runs to Yuni's 5.