One Piece: Dark Emperor Hegemony

When Ai Tian was reborn as a passerby of the White Beard Pirates and successfully stole the secret ability before Blackbeard, what kind of changes would it bring to the Pirates world?

Would Ace still die?

Would White Beard still die?

Would the White Beard Pirates still be hunted down?

Would it still happen above the top?

Where would Blackbeard go without his secret ability?