I can't seriously miss something I never had. The Red Sox never had Story's Silver Slugger bat from Colorado or Giolito's Cy Young (votes worthy) arm from Chicago.
Price and Lackey were never All-Stars, nor received Cy votes while in Boston, either. Martinez, Porcello and Sale were, and did.
I can say I miss the extended opportunities to see if Story's bat and Giolito's arm could reclaim past glories from before they were Red Sox.
Grissom is entirely different, as he's never been a big league regular or star -- yet. However, until/if he is, he'll always be unproven. He may not be Dalbec, but both guys starred at the same level in the same season, just last year... below the majors.