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).
So Rasengan is from his Dad, 'that Jutsu' is a seal from his mom. Both taught by the awesome Jiraiya.