I agree with EB. Wells stays in the lineup. Ichiro is hitting .272, 2 HR, 8 RBI's, .307 OBP. Wells is hitting .295, 9 HR, 20 RBI's, .343 OBP. Wells is far more productive than Ichiro. Since Wells bats right and Ichiro bats left, I can see Ichiro being platooned and Wells or probably Hafner being DH on those days, although Wells has hit more HR's (6) against right handed pitchers than lefties (3), but his average is much better against lefties (.347) than righties (.241). So maybe Wells would not be a good candidate to be platooned.
Hafner has been batting better than Ichiro also. So I see Ichiro as a bench role when Granderson returns. If Ichiro was hitting .322, like his lifetime average, I would see lggy's point, but he is not. Wells is batting better for average plus HR and RBI production.