BB influences gravity with himself at the epicenter. While Fujitora can do it anywhere? Am I missing something. Looks like Blackbeards DF isn't that good. No logia invulnerability, increased pain, harder to dodge stuff and it seems there is a similar fruit in the paramecia class which is better and doesn't have the same draw backs.
Apart from stopping DF powers, which can be achieved via Kairoseki, why did BB want that DF so bad?