Although Kakashi's a Jonin at this point, I highly highly doubt he has the ability to solo, even if Sasuke only has 2 tomoe and Naruto is restricted fox chakra. Naruto can overwhelm him with clones, and put a rasengan in there easily, Kakashi won't have a way to find or kill the real one and even his sharingan is only 2 tomoe as well at this point. Assuming it's EoS versions as well, Sasuke still has his Curse Mark, he's just restricted to the version of him from before he unlocked the 3rd Tomoe
I don't know the chance is slim, especially if Naruto can summon Gamabunta(without using the fox chakra which has never happened), and it could go either way for Young Kakashi or Naruto and Sasuke. Either side could win that, don't know who I'm leaning for at this point but it's not like with Obito added for added effect that Sakura is of much help. In the big picture, I'm not too sure.