yeah if he ever gets the chance to take some time off and train with that awesome bunshin method of his he will become beastly. with a few hundred bunshin there are a few things which he can learn in a short time which would make him even more overpowered than he already is, and now that his chakra control has improved and kurama will lend a hand instead of disturbing him that process will be amped up significantly.
he can:
a. learn to use rasengan in base with one hand. should be easier now that the kyuubi's collaborating with him and his chakra control's improved greatly, shouldnt take him more than a few days with the bunshin method. this will save him having to use clones to make rasengan sometimes and make him more formidable in attacking.
b.learn a second and perhaps element, which should take him less than a week.
c. take hashirama's scroll again and learn some kinjutsu, particularly element combination techniques, barrier techniques, and sealing techniques, which would make him more versatile and give him much more options in a fight, plus make his individual bunshins very formidable opponents in themselves.
d. take the time to really improve the speed at which he enters sm and how long he can hold that and km/bm for.
e. learn a combination of sm/km, which he can probably do alone what with him having done so before against nagato, or if not, by merging with ma and pa now that kurama isn't an opposition.
f. if possible, learn ftg.
g. collect as much of the sage's weapons as he can, iirc the alliance has them all bar the sealing pot. with his chakra levels he should be able to wield them very proficiently.
a 6 month timeskip with training methods easily within his reach would make naruto unstoppable and probably the greatest ninja since the sage.
