Oh my god. I hate "Minato Vs itachi" threads. It just causes world war three between two characters with the biggest group of fanboys lmfao
OT: Itachi doesn't have good stamina. He can only use 2-3 MS techniques at a time before suffering from fatigue in which he would have to deactivate his sharingan. Also, because of his stamina, he won't be able to keep his susanoo for a long time. On top of that, minato's speed is a huge issue. Once itachi is exhausted, minato can finish him off.
As far as edo's go, itachi is once again outclassed by minato but because minato has KCM which puts him in a completely different league.