Board Thread:General Discussion/@comment-6057702-20130730010329/@comment-11051098-20130909135343

As far as I understood it, given that the "20 comrades" included Ulquiorra and Yammy, those 20 were Arrancar #1 to #20. Grimmjow's Fracciónes were present, and they were #11 and #13-#16. There's also the 3 unnamed Arrancars who appeared in that chapter and were never seen again. The List of Arrancar page now says Aisslinger and Demoura are Arrancar #17-#18 and Charlotte Chuhlhourne, and from 1 to 20, only #12 and #19 are open, so there's one spot too little.

Also, if Aizen's comment indicates that it was 20 comrades in addition to Ulquiorra and Yammy - #1 to #22 - there's the same problem.

Abirama Redder is now stated to be #22, so the only spots open at the time were #12, #19 and #21. I read somewhere, sometimes, that Grimmjow was Arrancar #12 before becoming Espada (and Arrancar) #6 - so #12 was open, although logically #13-18 should have been pushed forward to #12-17

There's quite a few things I don't get to fit there. I could assume that Kubo changed his mind and that is why the 3 unnamed Arrancars disappeared and some numbers are open.