Personally I have a theory that the villain of this arc is God Elbaf himself and the main story of Elbaf will deal with potentially some oppressive characters in the sky, above Elbaf (the island)
The tree imo will be central to the islands plot and its connections to other locations
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@ShinichiMugi I think we repeat this idea that if theres no outstanding or obvious conflict, an arc will be short. Post Wano people didnt even think about Egghead as a possibility save for very few people. Then people thought it would be short because theres no conflict and its only about Vegapunk. Then Kuma happened. Then the serephim happened. Then CP0 happened. Then Kizaru and a Gorosei happened.
Nothing is obvious until we go there.