User blog comment:B214/Volume 23 discussion blog/@comment-31764731-20170419212923/@comment-31137559-20170420031646

The reason why they kept their Sacred Gears is because God is dead not because their soul is still human. God was the one managing the system yet he died and never foresaw reincarnated devils or half-humans being born. And Balance Breakers and Longinus were bugs that appeared in the Sacred Gear system because God wasn't there to control it. The only way a Sacred Gear will leave you is if it's of a certain type like Incinerate Anthem, you die(permanently), or someone extracts the Sacred Gear from you. Pureblood devils can't be born with Sacred Gears, but they can use them like Sairaorg does. That's an obvious flaw in the system because we all know that God wouldn't allow devils to have Sacred Gears.