It's that easy. Naruto has never used any element (other than wind recently) even when he was in Kyubi form. Konoha wasn't on fire during the invasion of Kyubi, Naruto hasn't shot fire from his mouth. Whats the big deal anyway? Would him having fire jutsu do him any good since any Uchiha could just copy them? Kyubi might have a specific element, but nothing thusfar has indicated this.
Originally Posted by Mr. Vengeance
♥ of the cards!
No matter the genius, they all fall to mediocrity in front of the Uchiha!