Nagato would win this fight, if that your answer than yes i agree. Each of these men can seal each other. Nagato sealing abilities to take away your soul, itachi ability to keep your soul in an eternal dream, and minato reaper death seal, though he dies in the proseess, im not sure if a clone can do it?
anywayz moving on, ability wise nothing itachi can do can really stop nagato, not even genjutsu as he can use all his path to overwhelm him. plus this is a winner takes all, every man for himself so no one would help the other person. being said that, itachi puting one of them into a genjutsu wouldnt help when he has 5 more bodies to worry about...
Lets say he is fighting nagato who has all the path in one instead of separating his powers and somehow manage to put him into a genjutsu then i suppose he might be able to win that battle. how ever if these men want to win they would fight at their strongest. so nagato using 6 bodies would be his best chance of winning.
As for Minato
he either has 2 options. retreat and go home and lose the fight but live. or fight and end up dying. yes he is the fightest ninja due to FTG, but i dont see him being able to with stand susanno or gedo mazo. FYI gedo mezo would own susanoo. it also has powers that nagato used against hanzo that if the soul seeking missiles touch you your dead... like i said ftg around the area either way one of them will either kill minato or itachi. And if they kill itachi, we have minato and his ftg. the only option for minato to win is doing the reaper death seal, and that would kill them both. Nagato can CT the area and kill them both, Or absorb any chakra including amatersu and rasengan at him.
fighting with all his path, he control life and death, unless they kill that path he can continue to revive himself, not that he would need to
