1. Itachi cannot use Susano'o arrows.
2.If Minato is hit with Amaterasu, he's done for there is no way of sealing black flames from hell that burn until the place the flames are inflicted, the only way Obito did it was Kamui.
3.Itachi can always use regular Sharingan Genjustu, Finger Genjustu, and much, much more. He's a master of genjustu.
4.Minato can't use Ma and Pa, for, he is not a Toad Sage.
5.Minato can't break Itachi's Susano'o, it has the Yata Mirror which is "indestructible."
6.If anything, Minato and Itachi's IQ are around the same area.
I'm not a fanboy.. Just facts.
Facts? Most of the stuff you said were completely based in the small fragment we have seen from Minato's abilities.
2. What about he uses FTG to flash away from Amaterasu? Even if he made contact with the Amaterasu, the flames become a "material" of this world, meaning he will be able to teleport without it. Minato has the choice of teleporting with or without the things he chooses. He chose to teleport Kushina, Naruto and Kyubi, but he left Tobi behind even when he made direct contact with him.
4. He may or may not be a toad sage, the lack of evidence about it says no, but there is no way to prove it or disprove it at this point. Anyways, the sage toads are able to be summoned, just not used with conjunction of SM, as they are in the same blood contract. I think the problem is not summoning the toads, but the amount of time it will take to summon them.
5. It is said to be "indestructible", but the only basis you have are Zetsu's words. Even if it isn't destructible, it is by passable, as Kirin was able to blow through it. I know the possiblity of Minato having a technique that equals Kirin is low, but that is not the point. Also, Yata Mirror does not cover 360 degrees.