Yup some chapters with the Sanin roaming around the mountain village would be nice....also making a comedy like scenes with akimichi clan eating around would be fun....
tie it should be a tie even black zetsu himself said Itachi had more raw talent than Indra otsosuki and even madara acknowledge his talent so best case tie worst case madara win and Itachi survive
If they are both edo the one with the sealing knowledge wins. Since both have unlimited chakra and can regenerate. Both have amatrasu and both hve sussano. So neither wins unless they seal the other. At best it would be a draw