Hmm... never thought about this, but if you break it down. Uzamaki clan kkg appear to be Sealing jutsus. The Hokage Yondaime, learn his sealing from Kushina, so it seems Naruto would be good at this, except, when it comes to Naruto, we're looking at what.?.. D+, C- on the ninja study scale... But if you think for a second, it seems that not many people can master the rasengan, which was an incomplete jutsu, which Naruto completed.... In other words, there is no signs for wind shuriken and yet not even Kakashi or Jiraiya could complete it... could the wind shuriken be naruto's KKG?