Naruto plot speculation 2

This is the second post of the naruto plot speculations series
SPOILER ALERT

At the beginning of the quest to recover gaara after he was kidnapped, ero-sennin (jiraiya) warns naruto against using a certain jutsu...it isn't anything related to the nine-tails form obviously because naruto has no control over his slipping into the nine-tails and it isn't the rasenshuriken which comes later...just wondering what it is...maybe naruto has the potential to be the next "yellow flash" like the fourth