Trey

The Narutoverse definition of genius is someone who is naturally gifted and blessed with a kekkia genkia or large chakra resort or a sharp mind. They essentially only need to hone their kekkia genkia skills or practice trvially on harder jutsus since it comes naturally to them. Gai and Lee had to work harder than most humans can imagine to become what they are, and still they aren't on other genius' levels. So we can exclude them from the list, even though they are commendable shinobi.