I dont think it is going to be Shika Fuujin, as when minato sealed the Kyuubi in Naruto he said he would use the Dead deamon seal, which was the "seal that only a Non-Jinchiriki could use". So There is a far more powerfull seal that a Jinchiriki can use, and that i think is 'that Jutsu'. The reason we have never seen anyone do the seal before is because no one else is a Jinchiriki that has shown skills with seals (like his mother had).
Originally Posted by Seke
So Rasengan is from his Dad, 'that Jutsu' is a seal from his mom. Both taught by the awesome Jiraiya.
Originally Posted by [JUiCE]