User blog comment:Sargenttacos115/Why are Sting and Rouge so weak?/@comment-117.227.194.37-20131110013056/@comment-1359322-20131114020613

I don't know if i could consider the constant beat up Natsu faces by challenging Erza and Laxus as as gaining experience but your points are valid. Also it can add another point to it, Sting and Rogue had Lacrima implanted in them becoming "3rd Generation Dragon Slayers" as they said, this might have made them more arrogant unnecessarily and slack off in their training since they thought they would be unbeatable, especially in their Dragon Force mode.