User blog comment:IamJakuhoRaikoben/Sorcerer Magazine, Issue 45: September 2015/@comment-25693405-20151017042430/@comment-1776824-20151017192339

Sting and Rogue had significant power boosts in their Dragon Force. Natsu in his base was just stupidly stronger because terrible writing. Also, as for Wendy, Chapter 432.