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It depends. I consider it fact that we have Gut's established level of performance after about 3.5 full seasons in the majors. You have 3 different metrics all saying around the same thing over the course of his career.
Whether those metrics give a 100% reliable take on Gut's defensive value or whether the single season defensive stats are reliable. is another question entriely.
Personally I think a mid +20 runs is his mid-range, but baseball is far from predictable.