User blog comment:Add799/Nine demon gates a type of celestial spirit magic?/@comment-1359322-20131028145819/@comment-7418318-20131028153107

If that was the case, wouldn't they just commit suicide to free their master?

It'd also be a re-use of Oracion Seis' body link that sealed up Zero.

Also how (or rather why) would Igneel have placed the keys to the seal of E.N.D. in it's own subordinates?

I like the idea of Igneel sealing up E.N.D. but the Nine Gates should not be the keys of the seal IMO.