now i know kishi didn't do this cuz of plot reasons but the last time naruto and sasuke clashed they went head to head rasengan vs chidori. but at this time naruto learned how to do a rasenshuriken. which means at this point he could've made a wind style: rasengan. if they clashed with the WS rasengan vs chidori wouldn't naruto have won that fight? (and also i know zetsu and tobi were both there but i think kakashi at that point could've given them a run for their money who knows we could've been having the tobi/naruto boss fight about 100 chapters earlier)