Yo! Name's Delta. I notcied the Dragon Fruit, and heard the news. I can help with this one. All four elements can't be under one dragon's control, it's against their natural vibe. You can have one 'breath element', as is the nature of a dragon's 'inner soul fire'. But, thanks to One Piece, this can be any element. Water, poison, ice, magma, any logia fruit. But one only.