Tobirama and minato would ftg fight leaving minato the winner. Minato runs away with his ftg because he knows he cant do shit then Hiruzen cries because he knows Hashirama is about to go beast mode
Very Hard to say. To be able to determine which person remains standing, you have to take into account the possibility of alliances occurring to take down one of them and also the amount of stamina they will be using up during the battle.