Iirc it was even stated that that Toei director has more knowledge than some of Oda's assistants in the manga.
Exactly the reason why I say "Toei Headcanon >>> Our Headcanon"
for example, I do not wanna sound gloomy, but If Oda dies as an example, Toei has more chances of ending the series as Oda wants than us the fandom.... It's a legit fact considering they have been close to him for years compared to us to know his desires or his vision, and on top of that how he speaks about each character individually and also add to that, the Toei Director knows how the show will end...
So, EVEN without Oda for example (assuming he passed away)... Toei are the closest people to finishing the series how Oda wanted...
Let's not forget that Oda is not only in contact with directors... BUT ALSO, with freaking voice actors... the dude meets with them, ave dinner parties with them... do you guys know the AMOUNT of little chit-chat they had we know NOTHING ABOUT...
I daresay that a SIMPLE headcanon by a voice actor from the Strawhat will be more knowledgable than our own headcanon... So let alone a WHOLE FREAKING STAFF MEMBERS... and one of them knows how the ending of One Piece will be! C'mon...