I guess I'll join Mikey. I don't think I need to write what I consider to be a genius because loads of people already said and I agree with them......... at least the one's on the first two pages.
And about the Fourth: Kakashi wasn't able to take the rasenagn any further either and he is a genius with a sharingan. If it wasn't for Naruto's stamina he wouldn't have been able to complete the ransengan either. I think it probably took him thousands of hours to complete with his clones.
@the people who said Naruto couldn't do the summoning without the Kyuubi, last time a checked his eyes turn red and he releases red chakra when he draws upon the nine tails. And if it wasn't for Naruto team 7 won't have been dead long ago.
O yeah Tsunda(I think I spelled it wrong) was already stated as a medical genius.
Mikey how do you hide your sig in one of those things that says [Show]