In all Minatos battles, he always has the element of surprise. He literally marks you before the fight gets started. People bang on about no knowledge of Amaterasu all falling to genjutsu. Please, spare me the bs; minat has already fought a much more powerful Uchiha than Sasuke and won with ease. Imagine minato put a bit more effort. And yes minato can evade Amaterasu even better than Raikage did.
Now what people also forget is that minato is one of the greatest geniuses of Naruto, he became hokage. Meaning he was also in command of the rest of the Uchiha clan. Do you think he would become hokage and not be weary of the strongest clans abilities. How the hell did minato know so much about Madara when he faced off against Obito.
I don't know why people think Sasuke can forever spam Susanoo and Amaterasu longer than minato can spam ftg. I've never seen ftg cause minato any fatigue when using it on himself. Transporting a giant tailed beast is another story. In all honesty, I don't even think Sasuke will get the chance to use Susanoo against Minato. One touch (gets marked) and its over, minato don't waste no time in any of his fights.
Without knowledge of FTG, Sasuke's first reation won't be to destroy every Kunai or dodge each one. He may just try and deflect one and that one move would be his downfall.