lol it's extremely shameless to see how many people overreact. the moment they see the biggest power, they start making things up in their imaginations. Making conclusions that they shouldn't.
All madara is doing right now is planting fear in the kages. If the kages lose, It's not going to be because of madara's op'ed power. Fear is the one that will defeat them.
Sometimes the biggest power anyone can have is believe, confidence, fighting spirit and why not some power to go with it.
I am sure if the kages lose their fear and actually "think", they can defeat even the edo madara + perfect susanoo + rinnegan + harishima