Board Thread:Versus Debates/@comment-26704954-20160301064038/@comment-7292165-20160304233956

Well up until Naruto, the previous databooks and manga said Hiruzen was the strongest Kage but then the 4th databook says Hashirama is but then again that one doesn't count Naruto either. So it's just a lot of retcon on Kishi's part.