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Well, there are reasons I don't think the Coors effect is going to be as pronounced for Smith. It may or may not shave 15-25 OPS points off, but its not going to be significant.
His HRs average 410 feet (Branyan-esque power). He has level swing and a high BB%, a solid CT rate. Hes lefty with above-average batspeed. He crushes power pitching. His swing is just the perfect fit for Safeco and I think hes a very good bet to traslate to the AL.
Smith doesn't even need to OPS 880 to be a 3 WAR full-time player. With above-average D, and a high OBP, he'll only need to get over that 800 OPS hump. If he goes into the mid-to-upper 800s, he an Ichiro/Guti esque player.