User blog comment:Stone Roger/Natsu and Zeref have somekind of relation?/@comment-174.141.213.58-20130415220325

Or maybe all dragon slayers were once the dragons themselves and zeref was acnologia and someone split there dragon magic in half one human and one dragon both with equal capabilities that would also explain why natsu/gajeel couldnt escape from frieds runes because there dragon forms they would all be +80 years old