User blog comment:Miskos3/Chapter 478: Stealth, Review/@comment-4401815-20160320011047/@comment-24102956-20160320182823

No, the reason why there are the Shields of Spriggan in the first place is because they are individuals who follow Zeref as Emperor of ALvarez for influence and power. Also they serve as commanding officers of vast armies from the Western Continent not even an immortal can control them alone and needed a chain of command to coordinate with them during a continent-wide invasion.