Madara probably defeated an 8 gate user before

[Uchicha Macho]

]Madara was the person who collect the different clans that make up konoha by using his powers ,stated by itachi.This mean Madara did encounter an 8 gate user and knew method to counter him from their battle.The past 8 gate user could be gai sensi or clan leader.What your taught?

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[Yanks]

Why did you post it three times?

 

[WolfHaley]

It was Tobirama.