What if it’s not Fujitora who ate the devil fruit but instead it’s the sword of Fujitora who has the DF’s power.
Now we have seen many occasions where the objects are shown as DF users like Spandam’s sword which somehow absorbed a Devil Fruit, Zou Zou no Mi.
Now whenever this ‘objects with DF’s power’ is shown , it is mostly not that powerful and doesn’t have much of an impact …so it is possible that Oda might show us the true terror of mingling Objects and Devil Fruits.
And one of the name of Fujitora’s techniques is Gravity Blade, blade being the sword. Hell, Fujitora’s sword doesn’t even look like it can do much damage but still he uses and keeps it.
When Luffy asked Fujitora the question about his DF, he didn’t answer….and more like, it looked like as if Fujitora was grinning and saying ,”Dude , I have no DF’s power . It’s my sword who got it .”
Zoro will fight Fujitora in the future , and a sword with a DF’s power would be a new and a nice opponent to him.
*Theory by Heavenly666Demon