Not only Madara, but Minato as well?

[Thundergod123]

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So, if I can say it right, then I think Minato learned a lot from Tobirama's lifetime and maybe he was the one who invented the jutsu or from other users....

But my point is that, how does Minato know about The Eight Gates Open?

 

[YellowFang]

Well, it wasn't an unknown phenomenon...

Minato is just surprised to see it because maybe never in his lifetime he saw anyone using it...

 

[warlee]

it must have been a documented and popular ability for gai of all people to discover it.

 

[AGoodBoy]

wtf is with you people? guy didn't invent this shit. guy was never said to have invented it. all these threads, about "how does blah blah" know about gates, are so ridiculous.

Well, it wasn't an unknown phenomenon...

Minato is just surprised to see it because maybe never in his lifetime he saw anyone using it...

when was minato surprised about gates? all he said was he didn't think guy could use it... seeing as he died when guy was like 12. he was surprised by guy using gates, not by gates.

 

[Avery Namikaze]

Everyone has the 8 gates, Gai just knows hot to unlock them. It's not that suprising.

 

[Xāvî1]

Well, it wasn't an unknown phenomenon...

Minato is just surprised to see it because maybe never in his lifetime he saw anyone using it...

this is a good explanation

 

[Uchiha Samater]

Well, it wasn't an unknown phenomenon...

Minato is just surprised to see it because maybe never in his lifetime he saw anyone using it...

ditto

it just takes incredible work from what we have seen from Lee and Gai

 

[YellowFang]

when was minato surprised about gates? all he said was he didn't think guy could use it... seeing as he died when guy was like 12. he was surprised by guy using gates, not by gates.

And that's exactly what I meant...
Minato was aware of Gates but not that Guy could use it...U_U

 

[Ovan]

While he was busy borrowing the FTG scroll, he may have come across the gates scroll.

 

[Avinash012]

Well they have considerable knowledge on shinobi world.