Board Thread:Theories and Speculation/@comment-28464629-20160515105435/@comment-1512913-20160515115955

Considering that the only way Hagoromo and Hamura could defeat her was by using Six Paths: Chibaku Tensei, they were having troubles too, so yes, in terms of power-level, Kaguya is the strongest, although Fuuinjutsu is her damn weakness lol.