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3.7 WAR is simply just an average of Gut's WAR per 629 PAs over the course of his career. I'd say thats the mid-range projection.
Hes only going to turn 28 in a month, so theres a good chance of him doing a little better than career averages offensively. Career numbers are usually the conservative bet though for guys in their late 20s, a little over 30.