Rereading some old stuff, its interesting that this was the original direction for Kid after already losing to Shanks:
While im not sure if BB or Shanks will fall at these locations, I am starting to think both Fullalead and Elbaf will be central to both at least as their main base of operations and lore/history.
I just feel like Kid's reaction to Elbaf may be related to this goal. The question becomes though if Shanks will even be there since he was going after Barto, but maybe by the point Luffy lands here, they meet again at least.