In Naruto With Saitama's Power

Mc reincarnates in the Naruto world as Itachi with Saitama's power. Think about what would happen if Mc has the brain of Itachi and the power of Saitama, it's the fusion between Itachi and Saitama. The novel will be overpowered, if you want to have growth from weak to strong then this is not your novel. I am okay with any good criticism of the novel so provide good feedback for the novel.