User blog comment:FairyRaven/Fairy Tail Chapter 363: The Stories That Demons Read, Review and Commentary/@comment-1153699-20131207173113/@comment-7418318-20131212103139

Look at it this way: Would the Dragon Slayer have been able to drive the Dragons to near extinction if they were vulnerable to everything except a single element?

Particularly Acnologia. Even before his transformation he was said to have killed hundreds of Dragons. If he could only absorb a single element, how was he supposed to manage a feat like that?