not a single FTG kunai will come near the itachi.
he is the best shuriken thrower by feats.
also he has better base speed feats than minato.
yah thats right minato has a single feat of instantanious base speed against tobi catching baby naruto.
itachi has shown that kind of base speed at more than 3 times the distance.
Dude I think that you are underrating Minato and you don't understand the prinicple of FTG.
It isn't just an attack where he throws a kunai straight at a person and then teleports to it. Go back and read the battle with A and Bee, he spreads kunai and FTG marks around so that he can instantly teleport wherever he wants to, in order to dodge attacks or set himself up for an attack.
That is why that argument is frankly retarded, not trying to be mean but if Itachi manages to hit all the kunai that Minato throws, (keep in mind that Minato knows multi clone shuriken jutsu) you know what will happen to the FTG kunai that he throws?
Absolutely nothing. They will end up in a slightly different place from where he was throwing them but they will still be scattered around the battlefield to where he can teleport to them at will to set up attacks and dodge Itachi's.
And why do yo doubt Minato's base speed? Think of how FTG works, in the kakashi gaiden there was a group of about 50 enemies that were all jounin level, as only jounin are allowed to fight on their own, and with people throwing his kunai he was able to wipe all of them out in the blink of an eye.
Do you know what it means to be able to wipe out that many people that fast? Sure he could teleport from place to place but FTG doesn't automatically kill the person and there is no way all those kunai went straight at each and every person and they did nothing about it. That means that Minato's speed after using FTG has to be insane and his reaction speed and thought process has to be even faster if he can teleport to each one, assess where he is and manage to kill the person and then do that fifty more times.
That is what people just don't get about FTG, it is pretty much useless unless you have some ungodly reaction times and inhuman speed.
By the way I still think Itachi would win via genjutsu, only because we haven't seen how Minato would deal with it due to his lack of battles feats being shown. Obviously A wasn't going to use genjutsu, and Tobi didn't either so how would he show a defense against it? Kishi doesn't make people show off abilities they wouldn't need in a fight.
But if for any reason Itachi's genjutsu wasn't much of a problem for Minato, then I don't see Itachi winning a long battle, Itachi either wins it in the first two minutes or he doesn't win IMO.