User blog comment:IlovefrogsandFairyTail123/My thoughts on Fairy Tail/@comment-4449950-20140506012010

I'm not sure I understand.

Gray and Erza's powers were shown long before they fought Lullaby. Erza's were in episode 6, only 1 episode after she appeared, and Gray fought Rayule in the same episode where his powers were shown. So... they didn't wait that long to reveal their abilities...

Plus, Natsu and Lucy are the main characters. It makes sense that they would be shown first and have their Magic explained first...

Just my take on things~