Sasuke has lost his bijuu power up so he can't even defeat his past self let alone current naruto.
Six Paths Yin chakra = Bijuus' chakra (in terms of power)
Sasuke lost his Six Paths chakra in his final battle so he collected bijuus' chakra in Susanoo to compensate for it. Now, he doesn't need it because he has ample Six Paths chakra to execute any powerful technique he wishes. Naruto better be lucky enough to collect the same amount of natural energy as before.
Naruto has full kurama and hoax abilities I don't think that sasuke will ever have a chance against him
Full Kurama gives Naruto no additional benefit.
It will give Naruto 2x more chakra, but Sasuke has Preta Path so he absorbs Naruto's chakra virtually gaining as much chakra as Naruto even if he has 2x Kurama. Even if Naruto has 1000 Kuramas, it still doesn't do any good because Sasuke will keep absorbing chakra when needed and gain just as much chakra.
And half Kurama collected ALL the natural energy there was present around them. Full Kurama will collect only that much i.e. all natural energy around. Even if Naruto has 1000 Kuramas, he will only collect as much natural energy as he did with half Kurama.
I see absolutely no advantage of full Kurama.
@bold According to the spoilers, Sasuke is the one gaining new hoax abilities.