We've seen what the Rinnegan can do, we've seen what MS can do and therefore have a good idea of what EMS is like, and although it's to a limited extent, we've also seen some of what Senju abilities are like. Madara has all of these, and on top of that he's an Edo. The Kage's are strong in their own right, but Oonoki is injured, Gaara is fatigued, and Mei is also battle-worn to some degree. This already puts them at somewhat of a disadvantage, so while we haven't seen all that they're capable of, I'm fairly certain Madara has an edge over them. I mean, if anything he'll just drop another meteor onto the battlefield. p:
And he as Mu to cover his ass if he would get sealed.
I mean Gaara got defeated by Deidara.
Tsunade got knocked out by Pain.
Raikage got nearly killed by Sasuke ( Amaterasu )
Tsuchikage is heavily wounded ( and he has back problems )
Only the Mizukage is still healthy, but she isn't that strong.
And don't forgot we haven't seen all of Madara's powers yet, i'm sure he has dozens of tricks upon his sleeves.
