Meh why not.
Ill explain two things here.
In kishi's manga, he acknowledges jikuukin ninjutsu as speed, because of this hiraishin > will always foot speed.
Any form of jikuukin will > footspeed.
That is where the alias, Konoha no Kiiroi Senko comes from.
So yes Ai is right, minato is faster than him.
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Alias "Used to indicate that a named person is also known or more familiar under another specified name"
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But who said, its speed i disagreed with it. You were and the OP were hinting towards reaction time, something that viz claims minato is roughly equal to v1 Ai.
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What Shee said was when Ai was in v1. In v2 its a different story
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That is the viz scan