A man who fought 10,000 shinobi, a rampaging BIJUU, an entire army regiment and KM Naruto definitely has the required strength to battle 5 kages, especially the 5 kage summitcommon, the third raikage is very strong, but the united strength of the 5 Kages is to much for everyone, except Madara and Tobi. Nagato could deal with them too by using Gedo Mazo.