And so far it looks like I was right that Mito was not involved in the fight.
Also about the Hashirama and Magara = Naruto and Sasuke parallel, Hay Kishi there's no need to put anymore logs on that fire, we get it, why not add some logs to the NaruSaku fire for a change.
ditto.
Simple answer they can't, in order to surpass them Naruto has to gain a power-up stronger then Kurama, and the only thing I can think of that is stronger then Kurama would be the Jubi which is supposed to be the most powerful entity in the Naruto Universe, so there shouldn't be any way Sasuke could match it, (of course I've been wrong before).