First off, Nagato actually never wanted. He wanted to know what his master's other student had to say because he knew that Jiraya would have told him about creating peace. Naruto gave Nagato a new hope after the battle as well.nagato couldnt defeat naruto how in the world can nagato defeat itachi??!?
Also that Nagato never used all 6 different paths in one body as he did against Naruto and Bee later on. With made them lose so hard. Nagato > Itachi.