User blog comment:1NF3RNO/Kazekage's Devil Fruit./@comment-4025092-20130602172035/@comment-4080028-20130602173450

I think it is needed, otherwise the characters who've eaten these DFs will have a noticable gap missing in their overall design. And as these characters were handed out to different users, that would cause trouble for the users as well, as it would mean they'd have an unfinished character in their possession.