Ships that approach the burned man are sunk by whirlpools. As we know, fishman can produce whirlpools. This means that the burned man must have fishmen on his crew.
This makes a lot of sense. As we know, the 4th road poneglyph was originally in fishman island.
At the moment, both Kid and Law seem to be dying at sea. They were seriously injured by the yonko. While Kid's injuries seem to be worst, as he isn't even conscious, Bepo was extremely worried about Law, telling him not to die, suggesting that Law's injuries are still very severe. Their ships were also both sunk and while Bepo, as a polar bear, is likely an extremely strong swimmer, I doubt he has the strength to swim from island to island. Especially since he took damage against the BBP.
My guess is whomever these fishman are, they will pick up Kid and Law, and that will kinda be how Oda will keep these two relevant. By tying their arc to the burned man.
My guess is that the burned man teaches them some sort of advanced haki, and they return as Elbaf as allies to help Luffy become Pirate King. With Law beating Shiryu(Zoro takes Mihawk) and Kid beating Beckman.
This makes a lot of sense. As we know, the 4th road poneglyph was originally in fishman island.
At the moment, both Kid and Law seem to be dying at sea. They were seriously injured by the yonko. While Kid's injuries seem to be worst, as he isn't even conscious, Bepo was extremely worried about Law, telling him not to die, suggesting that Law's injuries are still very severe. Their ships were also both sunk and while Bepo, as a polar bear, is likely an extremely strong swimmer, I doubt he has the strength to swim from island to island. Especially since he took damage against the BBP.
My guess is whomever these fishman are, they will pick up Kid and Law, and that will kinda be how Oda will keep these two relevant. By tying their arc to the burned man.
My guess is that the burned man teaches them some sort of advanced haki, and they return as Elbaf as allies to help Luffy become Pirate King. With Law beating Shiryu(Zoro takes Mihawk) and Kid beating Beckman.

Another fake lurking legend. 
I wish Oda would write it just like this