If Madara got back his rinnegan eye from obito,he will need Obito's ms to kamui out of the dimension.Therefore this mean Madara have to swap his eyes in the real world.This give Sasuke enough time to find Madara and use his speed or s/t jutsu to catch up to Madara again and finish him off.
Sasuke swap sword with Kunai or probably move at a lightning speed to collect the sword and stab Madara
Sasuke teleport Madara to the combine attack
Madara sage senjutsu + his rinnegan could not keep up with Sasuke speed ,therefore he got slice in half
Therefore ,it safe to say that Sasuke and Naruto must enter the kamui dimension by Some form of space time jutsu (either Naruto ftg or Sasuke seeing a kamui dimension and making a pathway somehow with his sharinnegan).This a better atmosphere to have their final battle with Madara .In addition,Madara ,Sasuke and Naruto can go all out without holding back on their powers.Madara being the jubi host should have more distructive powers which would kill the shinobi allaince if he was in the real world.It will be safer for them to fight in the kamui dimension.The kamui dimension will be a good place to seal the Jubi if Madara get extracted in the process (at the end of the battle
Sasuke swap sword with Kunai or probably move at a lightning speed to collect the sword and stab Madara
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Madara sage senjutsu + his rinnegan could not keep up with Sasuke speed ,therefore he got slice in half
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