im facepalming everytime i read Kakorat's comments here.
let me put it as simply as possible - what is KS? it is an illusion that affects 5 senses. what is a genjutsu? its illusions. that already is enough.
first of all, those arguments bcs chakra bcs reiatsu make me sick - i could say that nothing except plain physical attacks ir sage jutsu/chakra will work against obito and madara. oh wait! they dont have sage chakra/jutsu! that means they are restrickted to just plain melee without any special abilities. so if u dont like this logic, dont start with the this wont work bcs chakra or bcs reiatsu crap.
one thing is for certain tho - sasuke can absorb kido. madara and juubito are immune to them, or can absorb them aswell. i hope we can agree that kido = ninjutsu
sharingan only works on chakra 1. that is wrong, it is a precog that helps follow muscle movements and such, also can see through or resist all but the most OP genjutsu's. we already know what genjutsu and KS are. and thats just basic sharingan, which managed to see through tsukuyomi, which not only controls the 5 senses, but time and space aswell.
2. this is a crossover, i need to remind you.
so since, a sasugay thats not even an EoS version of himself could resist a superior illusion to KS. even with all this, sasuke might be among the worst in resisting illusions of his team:
Naruto has kyubi and other tailed beasts inside of him. and i have to remind you, kurama can snap naruto out of illusion. (tho its funny when kurama didnt help when naruto was in toneri's crab's illusion)
obito has a sharingan, rinnegan(it can see alternate worlds, just sayin). and has the 10 tails inside of him to snap him out if anything
Madara has 2 rinnegans, and a rinnesharingan and the 10 tails.
aizen is probably immortal, the same way madara is. if pushed to the edge, the hogyoku will start saying fk u to aizen and it will be basically the end of him. second option is for madara, naruto or obito pin aizen down with multiple rods and he will be unable to move, bcs whoever the owner is, he's restricting the movement with chakra. the third option - naruto and sasuke can use rikudo chibaku tensei to seal aizen away.
basically team narutards win, due to superior hax and having counters to most of the bleachdrinkers abilities.
1000 years later... aizen somehow crawls out of chibaku tensei, or some misguided people unseal him.
aizen: just as planned
juha bach: damn straight
madara gets reanimated/revived: you were saying.
kaguya: oh, you are so cute boys... ESPECIALLY YOUR CHAKRA/REIATSU!
grab the popcorn, badguys' mexican standoff begins...