Let me put in simpler terms, since you don't seem to understand what i'm getting at.
1) Overpaying is overpaying, regardless of position, and regardless of the quality of the player. I'm not comparing Lackey to Papelbon. I'm comparing their "overpaid" standing.
2) If you compare Papelbon to other long-term deal for relievers not named Rivera, you will notice they have all failed with the exception of Rivera himself. Including guys with similar track records who signed at similar ages. What's so different about Papelbon? That he's an "ace".