In my opinion, the things Oda creates as drafts, like the drafts for Z about the monster recruits, Whitebeard and Roger being in their prime at 38, etc., will remain valid.
Just like the core points he has written himself.
Sooner or later, even Bullet and his background as a monster on par with Ray (confirming Gaban and Ray are nearly equals) will be made canon, as well as what Oda wrote about Roger being the strongest (above Whitebeard).