I don't think the story has ever canonically mentioned a DF to the WG...
ever.
They have never said "hey let's talk about this person
who has this specific power.
Law is never stated to be special in the eyes of the WG cause of his power, its cause of his accomplishments. Big Mom isn't the person who rips souls out of people in her empire, she's the person who made an empire. WB isn't the person who can make earthquakes, he's the "strongest man in the world".
They didn't give AF about the fruit until someone said "hey, look at the fruit!". The WG worries about their accomplishments.
When Luffy went and washed Arlong, I don't see anything about his DF.
When Luffy got his 1.5b bounty, I don't see anything about his DF
They worry about accomplishments, not the Devil Fruit.