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I'm on board with the Griffey bench role, with the occasional start at DH.
There aren't too many guys worth having around for the "clubhouse" factor, but Junior appears to be the rare case where his presence in the lockerroom actually does some good for the team, particularly Ichiro. Not to mention he's not totally useless at the plate. He's had his moments where with rest, and against a good matchup he's still a dangerous hitter.
Bring him back, give him PH duties and 1-2 starts a week against right handers.