Board Thread:General Discussion/@comment-1429792-20130627104153/@comment-11477779-20130702100848

I think Quilge was a member of the Sternritter. I'm guessing he was just on assignment in Hueco Mundo when he ran into Ichigo and company. In chapter 500 he states he was assigned the letter "J" for "The Jail" just as other Sternritter are assigned letters.