Not that great in this case because JFK is practically an intro to Defector like Prelude is to Survival or Interlude to Hysteria, so it's not that big of a reprise, it's just a simple intro foreshadowing the next song in a "hey, this is what you're hearing right next!" fashion. If this same motif —or any other element of the album, for that matter— appeared somewhere else in the album, now that would be awesome.