User blog comment:Rejuvenation/Strange things in Bleach/@comment-1590714-20100222153805

1)Szayel may not be an expert on Zanpaktou, but he was right about this one - corporeal creatures do not necessarily have nerve systems, but this one does, seeing as that is the way Szayel took control - he took control of the nerve system (brain) of the Zanpaktou. So it is (in my eyes) sure to be an organic one.

2) If you re-read my words, I believe I said it MIGHT be that way. It is a possibility and as long as we haven't had any other explanation, seeing as this is speculation based on more speculation by Szayel and Ichigo, it is even though very unlikely still possible, as the opposite has not yet been proven.

3) Aaroniero had to eat every day, and we don't know how much time goes over the changing of the ranks with the Espada. It might have been he had just eaten a incredibly strong Arrancar or Hollow, gaining it's powers and abilities, but not yet having shown this to Aizen.

4) It is very well possible Aizen is simply toying with them, but I figured he was more practical, as every one of his actions is seen to have had meaning so far. If Aizen is just toying with them then that would mean he is taking his time, not thinking about who else but the Vizards could show up in the midst of battle. He is being careless himself.