Kind of funny that Madara was the first to arrive and not reinforcements from the allied army. Madara was still busy with the collection of the kages when the other ninja had nothing to do anymore. Maybe they are all just too afraid, seeing how the kages were no good against a lone man either. Naruto & Co could have used some support, though, especially in the form of more abstract techniques since physical ones fared poorly against Tobi. And they won't do any better against zombie Madara.

Too bad nobody still realises all they need to do against Madara is to stick a dagger with a paper slip into his neck. Kabuto even verified it works.