Read the title of the thread. EDO Madara! This means he can drop meteors, create moons just as easily due to infinite chakra, create over 9000 clones that can all use perfect susanoo etc etc etc. I'd like to see Naruto and Sasuke beat Edo Madara the same way. Damn, if the guy wanted, he could do a worldwide shinra tensei no sweat.
Normal Madara is actually vulnerable to Naruto's huge arsenal of jutsu (shadow clones and rasengan). Edo Madara will have to have his soul taken or be sealed, both of which are a lot more difficult than killing.
Sage of Six Paths has no clue wtf Edo Tensei is. He'll try and smash Madara, or create a moon that Madara's unlimited chakra can crap over. He wouldn't think to use Ningendo until it's already too late, and even when he does, it's incredibly hard to hit.
Also, remind me what the Sage can actually do to hurt Madara? I mean right now it looks like it'll be a taijutsu contest. Madara can open all 8 gates here without dying, assuming he CAN open them (legendary ninja, probably), but he'll win even if he can't.
Or maybe he'll play it safe. If it's just a matter of one outlasting the other, immortal body+unlimited chakra+unlimited stamina wins.