Kabuto vs Hashirama and Kabuto vs Madara
I actually think he would win both fights.
He has poison that can supress Mokuton.
A bite from his snakes=No Mokuton can be used
and no doubt in my mind that Manda II can do this as well, cause Kabuto has rebuild him from scratch again.
Snake eyelids+Dragonsage mode, block Kabuto his vision, but they grant him so many other senses, that he doesnt need his eyes for battle, making the Sharingan fairly useless.
Add his Sage Art: White Rage Technique, the sound vibration dragon sage jutsu, and Madara can forget about using his eyes.http://naruto.wikia.com/wiki/Sage_Ar...Rage_Technique
This jutsu can stop susanoo, as shown in the manga. That is how boss it is.
Already back in part one, Kabuto showed to possess high regeneration jutsus and great offensive and defensive medical jutsus in general, even complimented by Tsunade (who wondered if Kabuto was better in medical ninjutsu than herself in her prime). So he can drag the fight on for long. He has great endurance (and i am not even counting the sound nin jutsus, some take members their powers like suigetsu).
How can Madara with EMS beat Kabuto? Even Edo Madara will have problems with Kabuto i am sure.
Manda would take out the wood dragon (as far as its useful vs Kabuto).
Kabuto knows how to battle Mokuton and Sharingan.
Rinnegan might prove difficult but Sage Art: White Rage Technique, could be used to battle the Rinnegan.
http://naruto.wikia.com/wiki/Sage_Ar..._Reincarnation Can be used to battle meteors and even turn them against Madara.
Hashirama wouldnt be a match either, cause he is part of Edo Madara, who already does not stand a chance vs Kabuto.
Even casting Izanami on Kabuto, was shown to be difficult. Itachi would have lost his life several times if he wasnt Edo, or saved by Sasuke. Meaning this wont be an easy task for Madara to do.
If Kabuto finds himself, this jutsu would be useless vs him as well (its maybe the only thing that you can use as a dojutsu sharingan user, vs Kabuto).