Anyone actually think Jugo will play a role now that its been found out the Jubbi being composed of natural energy is vulnerable to it? Jugo's abilities are all nature chakra based. He is not going to fight, but he can bring the stuff in like its nothing. Anyone think its likely he will be a source of power for Sasuke to use in the fight? Technically Sasuke also wielded natural energy when he had the curse mark.
Maybe, it's not impossible, but... I think that Karin has the best chances to powe up Sasuke.
Before awakening a Rinnegan, or even mastering Juubi, Sasuke needs powers of a Senju lineage.
Karin has them, so it's pretty obvious that she'll play a big role for his powering up.
And of course, we will know about this thing she did to him in the past.
Prepare for flashbacks again!! o/