Ochoku is obviously his father. He held on to power on Pirate Island for 40 years. The WG had an interest in the island. They had tried to contract Rocks to clean it out. Later Ochoku started working for them when he kidnapped Shakky for the Human Hunting tournament. He must have become a Holy Knight at some point. When Harald became a Holy Knight, Garling told him he would receive a long distance Transponder Snail. I think Ochoku's snail, connected with Garling's, is still on Pirate Island. Blackbeard overlooked it. Caribou, who must have lived on Pirate Island, will find it and call. Of course there would also be an Abyssal Circle on the island. Harald was told to put one on Elbaf, after his ascension. Gunko will teleport in. Caribou might steal some things, perhaps even free and absorb Garp, and then fly away with the former princess Shuri. Caribou will be made a God's Blade of course...
