by Jeff FletcherFiled under: MarinersOAKLAND -- Ken Griffey Jr.'s triumphant return to Seattle doesn't have the happy ending the Mariners and their fans might have hoped, but it also hasn't been the failure that his .218 average might imply.The Mariners had their eyes wide open when they entered into this deal with the 39-year-old Griffey, fully aware of the limitations he might have on the field. They hoped that even if he wasn't producing in the batter's box, he would do...