User blog comment:FairyRaven/Fairy Tail Chapter 329: Seven Dragons, Review and Commentary/@comment-49.206.143.242-20130504142630/@comment-7418318-20130504184907

We don't really know what God Slayer magic really is. If it was really so powerfull, how could Natsu beat Zancrow and Wendy come out even with Chelia for 30 minutes?

Furthermore it doesn't seem to be matter of power. Surely people like Makarov and Jura are more powerfull than Natsu, but still they couldn't pierce the Dragon's denfenses, while a half-dead Natsu could.