While first reading Chapter 1037 you are lead to believe that the Gorosei and the Government Agent on the ship are in a conversation, but they are not.
Those are two separate conversations which Oda is using as red herring for us to think that the Devil Fruit is related to Zunesha.
First in this panel we see the GOROSEI on their usual room chatting about Wano and the outcomes of the war. No snail is seen there.
Then we cut back to the Wano sea where the Government agent is reporting the shadow.
We cut back to the Gorosei and they start talking about a devil fruit that hasn’t awakened in years and is a legend even to them (it is a legend to them because it has been in Wano this entire time, a closed country) and on this scene there is no snail to be seen to suggest the Gorosei are actually talking to these agents in the Wano sea.
That’s why I believe the devil fruit is not related to Zunesha but only Wano, as this whole conversation wouldn’t make sense if they were actually talking to each other.
*by The Strawhats Bible