User blog comment:IamJakuhoRaikoben/Chapter 413: The Book of E.N.D, Review./@comment-2214433-20141222172054/@comment-2214433-20141222174159

Gray is just stuborn because it means a lot to me to fulfill his dad's wishes. You guys are reading too much into it. And Natsu never cared enough to explain it to Gray, either.