[BiG ToE]

its hard to say, I'm sure having 6 bodies fighting 1 guy would be great and all, but after watching Pein fight Pervy, I woudl have to say, fighting Pein is like fighting a guy with a multi shaow clone jutsu. There was nothing really special about it. Keeping that in mind, Madra would still have an upper hand. If he was able to take on(toy) with Naruto and his group, Pein shouldn't be a problem. I'm not saying that Naruto and the group are equal to Pein, but I am saying that the number of people that come at Madra won't matter when you have Sharingan and can see all their movements, and even predict what their next movements will be.