Board Thread:Questions and Answers/@comment-24499616-20140208162134/@comment-4957813-20140209000820

As stated earlier, we don't know if Aaroniero or Szayel are in Hell for two reasons:
 * 1) The Hell Verse stuff are not canon
 * 2) Arrancar are considered as a different species, so we don't know what happens after their death.