User blog comment:FairyRaven/Fairy Tail Chapter 360:The White Inheritance, Review and Commentary/@comment-24066070-20131115194948/@comment-1359322-20131116090120

That's cause the top-elite guys are usually defeated by Natsu or Erza. In fact you can say most of the fights against powerful foe goes to Natsu and Erza only. The only top-guy Gray defeated was Lyon. After that most of Gray's opponent are either cannon-fodder or mid-class boss.