Irrelevant.
Fodder and rumors=/Ay, who clearly had to analyze the situation afterwards
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So, no matter how you want to play it, Ay reacted carelessly in situation where he knew little about his opponent. Nothing more, nothing less.
One man in the squad knowing it means they all received info on it. Period. Ay even responds to the fodder who said that with "Ah, so its him", yet Ay had no idea about the Yellow Flash or his jutsu amirite?

If you are going to argue that one man in Ay's
own squad knew of Hiraishin but Ay didn't, then you shouldn't even be taken seriously at this point.
Ay analyzing the situation=/=Ay not knowing about Hiraishin. Ay went for a straightforward attack and failed because Minato was fast enough to teleport before Ay hit him. So he switched his plan. He'd attack Minato and only use Shunshin when he teleported to another marker.
Minato already evaded Ay's top speed. Knowledge isn't going to change that.
Stop overrating Minato, Minato can only win if he's able to put a seal on E.
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Switch that Kunai with a Rasengan and not only is Ay going to take damage,
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Ay winning this or even standing a chance is nothing but wank. No one is overrating Minato here, manga has already given us the answer to this match up.