Board Thread:Specific Characters Qualification Exam/@comment-25152698-20141211020520/@comment-25152698-20141213164832

Umm, my argument wasn't about the fire ball jutsu at all. It was about all his other fire techniques, lol. So your excerpt actually almost confirms that he didn't know any other fire based technique prior to the age of 7. Which means, all the others would have had to be self taught afterwards.