User blog comment:Fliu/Chapter 969 Wano Wars: Revenge of the Kurozumi Clan/@comment-25161930-20200127060710/@comment-107.214.105.66-20200221193410

Either that, Bentham & Bart weren't the immediate successors of their fruits, and/or they were found outside Wano nad made their way to the East Blue to be sold like how the Gum Gum Fruit was found before Luffy ate it.