Gai was able to deliver so much damage and almost kill madara. If it weren't for his body taking a huge toll on itself. And Naruto and Sasuke are so strong now and they can't defeat madara fast already and end it all?
Well Madara is Running, when madara faced gai he did not have kaguya within him. and now he is even going to get the other rinnegan,
so this madara is stronger than the madara that faced gai sensei!!!