Too bad Hinata's not there. She could Gentle Fist one of the healers and flow chakra into them like she did with Naruto. The Hyuuga's still have some use. As far as who heals who, Karin could come in handy if Sasuke can bite her and she gets there in time. Something is going to happen as I doubt Naruto or Sasuke die here. Sakura healing Naruto has been set up. They look just like Tsunade and Dan, only not as bloody. This is pretty much all Sakura has left. She's not strong enough to battle Madara, so being a good little nurse is good enough. At this point take what you can get, even if you plan to downgrade Naruto's Uzumaki bloodline for it.
Parena or Serecham both equal Serena+Pancham!