I missed some of the discussion but I agree that this was a good one. It's safe to say that Karin will not die now.
In the most probable order:
1. Sasuke tells Sakura to heal Karin (or she volunteers to heal one of them). Kakashi gets close and Sasuke takes off. He may take off sooner if he puts two and two together (basically that Sakura probably didn't come alone).
2. Kakashi arrives before Sasuke takes off, A short chase begins and he will get delayed/caught. Madara will need to attempt a rescue from Konoha (awesome).
3. Kakashi arrives and Sasuke instantly puts him in a genjutsu. Naruto will finally arrive. Not sure whats gonna happen, but it will probably involve a lot of talking and trying to reason with Sasuke lol.
4. Sasuke and Sakura take off together. This is probably her best chance to stop him so I would imagine that she would try. It would mean Sakura did a complete 180 and I'll be thoroughly confused because there is no way in HELL Madara will be okay with Sakura suddenly on their side.
One problem with him getting caught is that the Kage's will want Sasuke's head so they will head to Konoha to make sure he is dealt with.
I totally agree, i mean what in the hell is sakura thinking??? of course madara will be suspicious about her intentions and i am quite sure that zetsu is around if not madara himself will notice kakashi or even naruto.
And for sasuke if he is really evil he will try and kill her right away, because she stood with konoha all this time if he doesn't do that its because he still has emotions...
And about her killing sasuke?? come on, that's a stupid and selfish act out of her, does she really want to be seen as a martyr, a person who couldn't do anything against pain won't do nothing to sasuke.
She is not thinking at all, just rushing foward to her death.... and i hope she will get close to it then perhaps she learns her lesson.
There are plenty of ways to help naruto, to lower his burden...not this way..