Board Thread:Versus Debates/@comment-26636534-20150711142533/@comment-6617792-20150716213628

Minato never needed to use sage mode but its obvious he can and kakashi calling him out on it means squat considering the fact that he can do it in little to no time and has the markings of someone who mastered it or is a "true sage". And the only time he used it was in the war as a much weaker and heavily handicapped edo tensei so of course while he is alive he is basically untouchable.