Board Thread:General Discussion/@comment-6057702-20130730010329/@comment-11477779-20130909055330

It could just be a story point that didn't pan out and was abandoned. Wouldn't be the first time. The impact was Toshiro saying Aizen only needed 10 to wreck Soul Society and then we cut to Aizen suggesting he has 20. Now, as the story played out I'm in full agreement that of ALL the arrancar we saw, less than 10 would fit the given definition of a Vasto Lorde from what I remember of their pre-arrancar status for those we saw flashbacks for. And that's why Aizen didn't defeat Soul Society. He never actually had more than 10! :D