Board Thread:Versus Debates/@comment-26005711-20160110125802/@comment-25122992-20160110193208

Naruto was able to use that weakness because he realised it's existence after hearing the stories Dodai and Eight-Tails had told him. Jiraya may have known about some events happening in Kumo, Eight-Tails numerious rampages included, but not to this extent. Only Gyuki himself remembered all the nessessary details of their clash for Naruto to deduce the true reason for the scar. Moreover, Third Raikage considered his self-inflicted wound as a shame of his whole life, thus he never told anyone in Kumo where had his scar actually came from.