Nobody really knows although minato bested him in his duel. I believe he should be able to repeat this feat. Saying that from what minato has shown us he needs much more than rasengan and a kunai to defeat the A, because he is very durable.
We saw him tank juugo's blast from point blank range. He was also surprised that sasuke's chidori wounded him a little which hints that he knows his defence is great
I say A ftw there is not tech we have seen from minato that can damage A. Third raikage took a rasengan with no trouble with his lightning armor. And A's barely was penetrated by chidori also plot no jutsu played a big role in that little duel against minato if minato wouldnt have thrown out those kunai he wouldve had his face smashed.
People always say that ftg is faster this is only true in a certain sense...sure the tech itself is faster but the process off throwing the kunai then transporting makes it slower to use.
You forget that they fought more than once so it wasn't just plot in involved. A was just unable to kill Minato
And A is still alive. Minato was just unable to kill A as well.
A's lightening armor cannot be penetrated by weak attacks like Minato presented with that Kunai. Sasuke has proven this when his chidori barely scratched the surface of A's skin when he hit him with it. Minato could have gotten trucked if Bee didn't step in if you wanna look at it that way.
It was Sasuke chidori against A lighting armor
It was lighting against lighting, obviously the damage would be like nothing.
A Fuuton rasengan would make more damage than Raikiri or Chidori.
*Not saying Minato has wind affinity*
Uh this isn't pokemon... The Raikage makes it pretty clear here.
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Not saying that he can't be hurt by other strong penetrating attacks. I doubt the Kunai that everyone keeps mentioning would have done any thing to the Raikage which people keep referring to. I don't think that Minato can use a rasengan strong enough to really put A down. Minato hit Tobi flush with a rasengan and all it did was break his arm.