Basically Itachi tells Naruto if you do everything alone you will fail which happened a lot in the past. Since Sasuke is kind of like Indra he does things alone rather with consulting people about their opinions on the matter. As a result, if Sasuke thinks he could just make decisions on his own, he will fail.I kinda see where you're going with this but at the same time I don't haha Could you explain?
Second part about the Hokage. The village have to acknowledge him to become hokage because if the village don't he's not a hokage. Since everybody in IT he still have a chance to redeem himself before everybody thinks he's unworthy of becoming Hokage because I'm pretty sure people are changing their opinions about him little by little. So he has to work to be acknowledged by the people of the village