Griffey may not be a perfect fit, but if going into the postseason, if you asked me whether I would rather have him up at an important time or Swisher, Quentin, or Dye, well that one is easy.
With all due respect, look past the name and look at the numbers. Quentin is on pace for over 40 home runs and 130 RBIs. His OPS is well over .900 while Griffey's is under .800. Griffey is a power hitter with a terrible slugging percentage for one (.432). If you'd rather have Griffey up at the plate over Quentin or Dye in the playoffs, well, consider the playoffs lost.
Also consider that Dye has a close to .600 SLG and over .900 OPS and exactly one more ring than Griffey. So yeah, I'd take all 3 over Griffey right now. He couldn't hit over .250 hitting in the National League.
We're not talking about Griffey in his prime. When was the last time he had an important at-bat anyway? The last time Griffey made the playoffs (due to being on a bad team, but it wasn't helped by the injuries) was in 1997.