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Bref's WAR stat is based on some BS stat called Rtot, which is, IMHO, a complete waste of time to even look at. It's about as good as Pete Palmer's old TPR fielding stats (i.e. crappy).
According to sources that are actually relevant...Josh Wilson was a slightly below replacement level player and Jack was even worse. Nishioka is a good 3-4 wins better than that combo if he does what other similar Japanese players have done on the average.