Once upon a time Ken Griffey Jr. electrified baseball fans, launching home runs at a record clip, while roaming center field in Seattle’s Kingdome. Fast forward to May 2010, Junior is back in a Mariners uniform, about to nap his way out of baseball.At 40 years old chronic injuries have stripped him of his gold-glove caliber defensive skills, so the M’s have him penciled in as Designated Hitter