User blog comment:IamJakuhoRaikoben/Chapter 442: The Law of Space, Review./@comment-24277053-20150629140512/@comment-7418318-20150629200644

The only Demon Gates I am absolutely sure to be dead are Kyouka due to being linked with Face and Mard Geer because Zeref burned his book.

For the others I wouldn't want to take any bets.