User blog comment:Sosuke Aizen008/Maybe Starrk or Szayel or Nnoitra./@comment-11003280-20130810065146/@comment-11051098-20130812203504

Well, that was in a special chapter made to promote the 4th movie, Hell Verse. I don't know if it can be called canon.

But otherwise you're right. Hollows devour other souls on instinct, Arrancars have regained their reason as Nelliel once stated, and are aware of what they do. So maybe they end up in hell.