User blog comment:Mythical zoan fruit enthusiast/For those who want Luffy to have Mera Mera and Gomu Gomu/@comment-9101417-20130509142944/@comment-6920514-20130509144643

Nonetheless Devil Fruit aren't the only measure of power in the world. Garp didn't need one to be the hero of the Navy, Rayleigh didn't need one to be the first mate of the Pirate King, Shanks didn't need one to become a Yonko. Also, last I checked there were plenty of strong characters who were doing just fine with the one devil fruit. Luffy has yet to fight serious and Film Z is noncanon. Let's be patient and see how strong he really got.