Oda keeping them for future use, if need be.
It IS HIS story to tell...
Oda himself admitted he writes OP to his own 13 year old self. So, nothing much for us readers to do about it. Just read it as he tells his story.
I now read One piece knowing Oda can in fact pull this at any time now.
it’s literally Oda himself coming out of the manga and telling the reader to shut the fuck up.