Joyboy couldn't possibly store his haki in the nika fruit, cause it would have only respawned/take form again, when Joyboy would have died. It's impossible for a dead person to give around his haki.
I really wonder if they got teleported or blasted away. If they got teleported, it opens pandora's box. Can be cool, if done right, can also be absolute horseshit, if done wrong tho