User blog comment:Sargenttacos115/Natsu and Gajeel age Theory/@comment-108.129.33.178-20140715134145/@comment-172.56.20.157-20140716034856

There is a flashback of a person similar to Natsu fighting Acnologia in the ancient times. Don't believe me? Look it up for yourself or read the manga. This person had a scarf similar to his and also used fire to defeat Ac.