A thread for discussing the various points in the plot of the series that have yet to be fully followed-up on. What I think are examples of such points include:
2 - Why the One Piece came to be
19 - The origin of Devil Fruits
56 - The All Blue
96 - Tashigi’s relation to Kuina
100 - Dragon’s answer to the World
154 - The Will of D.
184 - How objects can eat Devil Fruits
192 - Why Pluton came to be
218 - The Void Century
224 - Emerald City
301 - Why Poseidon came to be
375 - Why there's no night at Enies Lobby
395 - The Great Kingdom
490 - Red-eyed shadows
497 - The Twenty Kings that created the World Government
507 - The Voice of All Things
524 - Why Tequila Wolf’s bridge was built
540 - Crocodile’s secret
577 - Blackbeard having two Devil Fruits
584 - Luffy’s mother
603 - Kuma’s motive for protecting the Sunny
610 - Fish-Man Island’s fate
648 - The Noah’s mission
649 - Joy Boy’s promise
650 - Why Uranus came to be
700 - The Rocky Port Incident
705 - CP-0’s intent
722 - Why the Nefertari Family choose not to live in Mary Geoise
793 - Kuzan’s affiliation with Blackbeard
802 - Why the Minks have lived on Zou for 1000 years
809 - The Dawn of the World
816 - The Minks’ connection to the Kozuki Family
821 - Zunesha’s crime
853 - The Three-Eye Tribe’s power to hear the Voice of All Things
905 - Why Ryokugyu didn’t have to eat for three years
906 - Mary Geoise's secret treasure; The giant straw hat at Mary Geoise
907 - Shanks’ pirate discussion with the Five Elders
908 - Bonney’s relationship with Kuma; Im’s motives
951 - King’s nearly extinct race and the two other races missing from Totto Land
956 - The incident with the Nefertari Family; Sabo’s fate; SWORD’s goal
957 - Rocks D. Xebec; God Valley’s fate; The Special Science Group
964 - What Toki knows from over 800 years ago
966 - Blackbeard never sleeping
967 - Joy Boy’s connection to Laugh Tale and the One Piece
968 - The Sea Kings’ two sovereigns; Wano’s opening for Joy Boy’s reappearance
996 - Momo’s survival for the dawn; The poneglyph Law found
999 - Yamato’s knowledge of the D. name
1000 - Oden’s description of the future
1003 - CP-0’s desire to see the pirates take each other out
1004 - The shadowed healer
1014 - Kaido’s familiarity with Joy Boy
1015 - Luffy’s communication with Momo and the Heart Pirates
1016 - Kaido’s reason for being at Wano
1017 - MADS; why the Government wanted the Gomu fruit
1018 - Sun God Nika
1019 - How Kaido got the Inu fruit
1020 - Wano's guardian deity
1023 - God's Land; Lunarians; Zoro and the Shimotsuki
1025 - Yamato and Kaido's oni background
1028 - The World Government annexing Wano
1031 - Sanji's switched eyebrow
1033 - The eradication of the Lunarians
1036 - King's discussion on Joy Boy and the Pirate King
1038 - The grim reaper
1040 - Zunesha’s relationship with Joy Boy
1044 - Luffy’s association with Joy Boy; will of Zoan devil fruits