If Madara is the only Edo Tensei then he just drops a meteor on them and it's probably over. One thing is that Mu might be able to use Dust Release and destroy it but since Onoki didn't, Mu probably won't either.

If they are all edo's then I don't know who would win because I'm not sure any of them except Rasa would have a sealing jutsu. Madara still might win with wood clone Susano'o spam but it's not as clear cut as if they weren't edo.

Fair point. I wasn't very clear.

My intention was to emulate the original Five Kages vs. Madara fight as much as possible; that said, I retained Madara's Edo Tensi status while intending to have the other five Kage fighting in living form; also, I wanted them to possess the strength level they had at the moment of death, hence Hiruzen being old; the other would appear much as they did in the manga/anime, just not as Edo Tensi.

Alright then, in that case I believe that Madara would win. Madara could defeat them quite easily (I think) and the only reason the 5 kage lasted so long against him in the manga/anime is because he was holding back. If Madara went all out, none of them would stand a chance. All he would have to do is spam Wood Clones with Susano'o like he did in the actual fight, only this time using Perfect Susano'o and I think it would overwhelm any combination of Kage (except the 7th Hokage).

I'm pretty sure Onoki didn't use the Dust Release against the meteor because he didn't have enough chakra, which I assume Mu would not have at this point in the fight. That being said, I doubt Dust Release would stop Madara from getting at least one meteor to drop on them and at that point he's basically won.