MADARA UCHIHA(Non - Eno Tensei)
-Mangekyo Sharingan
-Rinnegan
-Cannot use Genjutsu since it can't be countered by the Admirals
-cant use wood style or healing
Madara should have healing and wood style since having those is what gives him access to the rinnegan, but lucky for him, if he has rinnegan he doesn't need those to defeat the admirals.
Of course if genjutsu was a thing the battle would be an instant win.
Let's keep in mind that the six paths of pain's abilities were all Madara's rinnegans abilities. He had access to all of them just like Nagato could perform all the six techniques on his real body while wearing Madara's eyes.
Would Madara's rinnegan ability of absorbing chakra attacks work on absorbing magma, ice or light projection attacks?
In my opinion, it should work; those attacks are no different than elemental jutsus. If Madara can just absorb those then the fight would be an easy fight.
If Madara can't just absorb their elements then they would still have a chance, I guess.
The superior numbers of the admirals would be easy to turn around with shadow clones or with rinnegan's giant animal summoning techniques. Even if the animals could only work as distractions, shadow clones would make it easier for Madara to land certain techniques.
We know Madara was superior in a fight against the nine tailed beasts fighting him together while Madara literally had no eyes in his face. So that means while Madara was blind and had no sharigan nor rinnegan abilities. If he was able to dodge their attacks and hit them back under those conditions, then Madara with his rinnegan can certainly dodge the admirals attacks no matter how massive or chaotic they are. No to mention he has his fan, Kawarimi no Jutsu and Deva Path's repulsive forces for defense and if he gets in a real pinch he can just go full Susanoo and stop their attacks.
How would the admirals defend themselves against Chibaku Tensei? A strong gravity attack that pulls and crushes them into the air. A sealing technique that it took Naruto to go 8 tails to escape. I can see Kizaru escaping by being faster than the gravitational pull, but not Aokiji. Any admiral stuck in Chibaku Tensei for long enough could just be either launched into space (if Madara had enough chakra and strength to pull two giant meteorites from outer space, then he also has the strength to launch some smaller Chibaku Tenseis into outer space).
In this fight Aokiji would be the admiral's main defense against Madara. We have seen how a standard jutsu from Madara has the same strength as multitude of shinobi using a counter jutsu together against him, so it would be easy for Madara to use any of the many water jutsu he's copied to turn the battlefield into a sea like Tobirama and Kisame were able of. This would be a guaranteed win technique against Kizaru if Aokiji couldn't freeze the water for them.
I guess Akainu could potentially just evaporate the water around him before actually getting wet, but it's not something we have seen him do yet.
Another technique the admirals have no defense against is the Human Path soul snatching technique. Even if the three admirals have long range techniques, they all favor close quarter combat when in a 1vs1. If they're divided through the animal summons and shadow clones, Madara can manage to be 1vs1 against any of the admirals if only for some moments. He may not have that many ways to damage the bodies of the admirals, but if he can put his hand over their head (something that seems easy to me for Madara, especially when fighting enemies that aren't aware of this ability) he can just snatch their soul away and kill them without damaging the bodies, and his shadow clones could also pull the technique.
And I think I've already given this too much of a thought. Admirals are amazing and some of you know I love One Piece more than Naruto, but Madara is too much of a monster for this fight.