What I am getting out of this is Kuma sending the group to fly off, isnt just because for order, to save them or for a training arc.
There is something time related going on here.
Just how Toki had her entire thing with 20 years into the future.
Just how Shanks decided to NOW go for the One Piece.
Just how Roger was too early.
Luffy was too early as well and Kuma made sure the timing is right.
Either Luffy himself or Nika being the key.
The One Piece cant be found or used or whatever until a certain time has passed/it is a certain year/a certain event?