Tobi said the The Sage of the Six Paths developed a seal to suppress the juubi and makes a jinchuuriki and that the seal is being quietly passed down
http://www.narutobase.net/manga/Naruto/467/14
notice how the chakra around the sage of the six path resemble naruto's
http://www.narutobase.net/manga/Naruto/499/12
and the younger son
http://www.narutobase.net/manga/Naruto/462/12
I'm thinking that maybe the Younger son was taught by the Sage the seal. The Sage chose the younger son to be his successor because he believed that love was the key to peace. The Sage told the bijuus that someday they will all be led down the right path and that's why the sage would teach the younger son the seal, who believed it's through love
http://www.narutobase.net/manga/Naruto/572/11
mito said the vessel has to be filled with love before sealing the kyuubi
http://www.narutobase.net/manga/Naruto/500/6
The Younger son's descendants were the Senju and Uzumaki
the uzumaki were known for their sealing techniques and long lives and Naruto's seal was taught to minato by kushina which was based on uzumaki clan seals
http://www.narutobase.net/manga/Naruto/500/3
because of the uzumaki clan's sealing technique they were destroyed in that era of war
http://www.narutobase.net/manga/Naruto/500/4
so the seal was probably eventually passed down to mito who sealed the kyuubi during the fight to aid hashi
http://www.narutobase.net/manga/Naruto/500/5
kushina who was the next jinchuuriki was taught by mito the seal
kushina thought it was funny that mito was the wife of the first hokage while she was the wife of the fourth
the raikage said that the fourth learned the special seals of the uzumaki clan
http://www.narutobase.net/manga/Naruto/544/5
Kurama also recognizes the new seal Naruto has as The sage's
http://www.narutobase.net/manga/Naruto/499/14
naruto's bijuu mode seal resembles the pattern shown when the sage was talking to the bijuus
http://www.narutobase.net/manga/Naruto/571/5
http://www.narutobase.net/manga/Naruto/572/10
and that's why naruto said his dad didn't fail
http://www.narutobase.net/manga/Naruto/541/10
and that naruto was entrusted the task to be the savior by having the seal
http://www.narutobase.net/manga/Naruto/544/8
while nagato the person who jiraiya believed at first to be the savior was given the eyes and tried to use power to get peace but the whole time it was madara and tobi behind it
http://www.narutobase.net/manga/Naruto/373/3
Nagato an uzumaki thought to be the destined child had the eyes
naruto has the seal maybe which given to him to fight madara and tobi





































