I remember in one book about Oda's sketches there are some sketches of Blackbeard family,his mother and sister,that should have appeared when Ace and Blackbeard met. Then he cut that moment. But maybe he didnt cut off the characters? His mother and sister will appear somehow? I remember the sketches were saying that they should have been women of a noble family,but in Oden flashback we see that Teach told Whitebeard he was an orphan. Maybe Oda just changed his mind about Teach's origins?
And about Nami,i remember that the first script written by Oda for the Strong World movie was about Nami's origins,and apparently it was very dark. Was Oda going to reveal something big in a movie like he did with "Laugh Tale" in Stampede and Shanks being a Figarland in Red? Or Nami's origins are just filler and not important for the story? We'll see!