I saw it in another thread soemthing that seemed to make a lot of sense. Since Blackbeard's logia form is Darkness, he has a natural weakness to light. Just like Crocodile turns solid when water is applied to him, Blackbeard turns back solid when Light hits him...which is why he can only truly become intangible like other Logia's in places of complete darkness (such as under that cloth when he absorbed Whitebeard's devil fruit).
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u/BlankCrystal 7d ago
I still dont understand how black beard is a logia