User blog comment:AYET/(95) The Last Shichibukai/@comment-5951903-20130325074352/@comment-4754162-20130326041634

Hmm... at the moment, chances for Apoo being the last shichibukai is rather slim, because he, like Law, has been seen having an alliance with other (fellow) supernova. During the short interlude at the marine HQ, with Commodore Brannew addressing the identity of supernovas, he said something like "...will have to reconsider Law's status following the alliance" before being cut by Sakazuki. Should Apoo be a shichibukai, Brannew's statement there would have included Apoo as well...

So, not that I want to slam you on your theory but the chances are very slim about Apoo...