User blog comment:PhoenixRising101/Gura Gura No Mi/@comment-3119203-20120310163007

I think that this fruit is one that depends on the physical strength of the user (someone proposed this a long time ago, and I liked it), which is why Whitebeard was able to do so much damage. However, Blackbeard, while strong, is not able to do as much damage as Whitebeard (yet). And Blackbeard wants to be the Pirate King, he doesn't want to control a world that is nothing but a few scraps.