Sage Mode's drastic boost to his Ninjutsu (Base Naruto's Ninjutsu to Sage Mode Naruto's Ninjutsu) gets applied to KCM Naruto's Ninjutsu, so any FRS used would tear Itachi's Susanoo apart, if not 1, then 2. Kakashi's Kamui is nice and all, but enhanced Shunshin speed and clones mean that Naruto can stop his original body from being warped, and it lets him evade even if the original gets caught in Kakashi's LoS. Obito is going to be the hardest to take out, but his only way to finish Naruto is to warp him, and once he goes for that, he gets banged by Naruto's Flash Shunshin speed. Though the trickiness Obito offers may let them win.
Minato definitely wins though. Mid difficulty.