if having a powerful genjutsu was the determining factor in winning a fight, shisui could never be beaten. but we know that danzou managed to steal one of his eyes.THe battle would go to itachi.
the moment minato looks into itachis eyes it's game over.
and if minato is not looking at itachis eyes he can't see amerterasu so he won't dodge it
your whole point is based on minato being still. his base speed is one of, if not the fastest of his time, and he has teleporting, so itachi will have a hard time hitting him with either. unless you think that itachi will walk into the battle with ms activated ready to use tsukuyomi. he COULD hit minato with tsukuyomi as soon as they face off, same as minato could hit him with ftg and rasengan in the first 10 seconds. neither scenario is likely to happen