One Piece’s 7 question marks that no one can answer

first. Brook is 88-90 years old, but why is his hair still black? Is his “living” skeleton immortal?
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2. Luffy after all is Dragon’s son or not? Why does Luffy look exactly like Roger when he was younger?
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3. The Kuina that Zoro hadn’t defeated as a child had fallen down the stairs to death? Is Tashigi the same Kuina who grew up after losing her memory?
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4. Why did the red-haired Yonko Shanks get his left arm bitten off by the sea king?
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5. Why does “tyrant” Kuma know where the members of the Straw Hats were sent to train for 2 years? Where does the name “violence” come from?
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6. Is Marine Vice Admiral Tsuru Luffy’s grandmother?
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7. Why doesn’t Buggy recognize the straw hat Shanks gave Luffy?
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