User blog comment:Imhungry4444/Above and beyond/@comment-16344653-20111024153411/@comment-16344653-20111024154407

No. Each guild decides on their own their way of choosing S-Class Mages. For example, Phantom Lord's S-Class Mage were all defeated by non-S-class (except Aria) and Jose Porla (Wizard Saint) said that if Erza would've been able to use her full power they would have been even in power