What was minato thinking...
I've just completely destroyed the guy who appears to be madara! Better suicide shield my wife so I can put this monster in my newborn child because only someone with the 9-tails can defeat madara. (even though I just completely humiliated him with no knowledge)
I even have a FTG seal on him, allowing me to teleport directly to him and attack him whenever I would like. You see, it never actually wears off, so I could keep attacking madara at any moment for the rest of my life. In fact, if I was feeling up to it I could probably go kill him right about...
15 years later...
Minato kills obito (aka 'madara') faster then anyone else, including naruto with BM, with 1 slash.