Board Thread:Questions and Answers/@comment-50.8.182.51-20130311070358/@comment-151.143.49.236-20130328230943

Given the conclusion of the anime and how the structure is setup. The "demon lords" are more of a status title and symbol of relative power and where it originates from (within) rather than given or gifted (gods/divine powers). As such, in order to lose that status, they would have to have it take or given up willingly (leticia).