Depending on how the next few arcs link up, i can very much see 2 things happening:
- Heavy Rocks lore at Elbaf (provided the burned man isnt Saul and is potentially Rocks after surviving God Valley). This leads to a big event at Beehive with BB, potentially being either his living will or heir. This arc also has tons of potential to address former Rocks pirates, silver medalists and underworld characters if they all converge here at the end of the New World.
- Revolutionary involvement that leads Dragon and Garp to meet at least once. Maybe Garp even dying here to save Koby.
With this order (Egghead -> Elbaf -> Beehive), I "could" potentially see BB go down here on the last leg of the journey assuming Beehive is it before Lodestar/LT.
Honestly way more invested in this possible plotline than i ever was with PH -> DR-> WCI -> Wano.