First of naruto's chakra will make water evaporate like GUY. And itachi cant use genjutsu. Naruto is the best at close range and Wind Style. He windss agaimst lighting and water bro!!They only need to last 5 mins than Naruto is died .
Why would he use BM? He would just go KM and make 20 clones for both Itachi and Kisame and overwhelm them. And clones can not be effected by genjutsu so its over for Itachi and the real Naruto could just sit in the background and shoot off normal TBB's until he hits them.Kisame can hide behind Itachis susanno. Kisame has the ability to take out chakra. Naruto will have to rely on Bm mode. Once the 5 minutes are up he's screweed. Naruto is not completely immune to genjutsu. It will take time for the Kyuubi to react to genjutsu and if you don't think Itachi wont take advantage of that gtttttffffooooo
40 km clones is a bit much and the more clones the less powerfull. As for shadow clone spam. I have little worry Itachi and kisame would make light work on their clones. Kisame being able to asorb the chakra would just make him stronger. Why wouldn't genjutsu work on clones again?Why would he use BM? He would just go KM and make 20 clones for both Itachi and Kisame and overwhelm them. And clones can not be effected by genjutsu so its over for Itachi and the real Naruto could just sit in the background and shoot off normal TBB's until he hits them.